SECTION - I (40 Marks)
1) Name the following:
a) Opening on the stem through which transpiration occurs.
b) The organ in man concerned with maintaining water balance in the body.
c) The photosensitive pigment present in the 'rod' cells in the retina.
2) Select the correct answer out of the four available choices given under question. Rewrite the correct answer from I to VII:
I. Osmosis involvs diffusion of:
i) suspended particles from lower to higher concentration.
ii) suspended particles from higher to lower concentration.
iii) water from the more concentrated solution to the less concentrated solution.
iv) water from the less concentrated solution to the more concentrated solution.
II . Transpiration pull will be maximum under which of the following conditions :
i) open stomata, dry atmosphere and moist soil ?
ii) Open stomata, high humid atmosphere and well irrigated soil ?
iii) open stomata, high humid atmosphere and dry soil ?
iv) closed stomata, dry atmosphere and dry soil?
III. if the rate of respiration becomes more than the rate of the photosynthesis, plants will
i) continue to live, but will not be able to stored food.
ii) be killed instantly.
iii) grow more vigorously because more energy will be available.
iv) stop growing and gradually die of starvation.
IV. Which one of these reactions occur during photosynthesis :
i) carbon dioxide is reduced and water is oxidised ?
ii) water is reduced and carbon dioxide is oxidised ?
iii) carbon dioxide and water are both oxidised?
iv) carbon dioxide and water are both reduced?
V. Excretion commonly involves :
i) removal of all bi-products during catabolism.
ii) removal of by-products doing anabolism.
iii) removal of nitrogenous waste.
iv) all of the above .
VI. In mammals, the corpus callosum connects:
i) the two optic lobes.
ii) the two cerebral hemispheres.
iii) the cerebrum of the cerebellum.
iv) the pons to the medulla oblongota.
VII. Which one of the following is the route that a sperm follows when it leaves the testis of a mammal :
i) vas deferns --> epidymis --> urethra.
ii) urethra --> epididymis--> vas deferns?
iii) epididymis--> urethra --> vas deferns?
iv) epididymis--> vas deferns --> urethra?
3) Give below is an example of a certain structure and its special functional activity, e.g., kidney and excretion.
On similar pattern fill in the blanks.
a) Blood platelets and_____. Coagulation of blood.
b) Hydathodes and _____.
c) Chloroplasts and ____. Photosynthesis
d) Meninges and ____.
e) Neutrophils and ____.
4) Choose the odd one in each of the following:
Example: Calyx, Corolla, Style, Androecium . style
b) insulin, blood sugar, adrenaline, thyroxine.
c) Oestrogen , progesterone, testosterone, prolactin.
d) larynx, pancreases, testis , ovary
e) cerebrum, cranium, cerebellum, pons.
f) Cortex, pelvis, retina, medulla.
5) Match the Column
COLUMN I
i) The blind spot
ii) The yellow spot
iii) The stroma
iv) The grana
v) Cretinism
vi) Myxoedema
vii) Afferent neurone
viii) Mortality
COLUMN II
a) carries impulses away from the brain and spinal cord.
b) carries impulses towards the brain and spinal cord.
c) is the place for aerobic respiration.
d) is the place for dark reaction of photosynthesis.
e) is the place through which transpiration takes place.
f) is the place for light reaction of photosynthesis.
g) is the number of deaths in a specific period of time.
h) is the number of live births in a specified period of time.
i) is free of a rod cells .
j) is the exact centre of the posterior portion of the retina .
k) is a condition due to undersecretion of thyroxine in an adult.
l) is a condition due to the lack of thyroxine in a child.
SECTION - II(40 Marks)
6) The following simplified diagram refers to the outline plan of the circulation of blood in a mammal . Study the diagram and write the number and the name of the blood vessel in each case as mentioned under:
a) Several hours after a meal containing a lot of protein, which vessel will contain the highest concentration of urea ?
b) Which vessel would contain the highest concentration of amino acids and glucose soon after a meal ?
c) Which vessel begins and ends in capillaries ?
d) Which vessel will contain the smallest numbe of red blood cell peer unit volume of blood?
e) In which vessel will the blood carry the most oxyhaemoglobin ?
7) The following diagram represents a mammalian kidney tubule (nephron) and its blood supply. Parts indicated by the guidelines 1 to 8 are as follows :
A) U-shaped loop of Henle 2) Proximal convulated tubule with blood capillaries, 3) Bowman's capsule 4) Afferent artriole from renal artery 5) Glomerulus 6) Venule to renal vein 7) Collecting tubule 8) Distal convulated tubule
Study the diagram answer the following questions in each case :
a) where does ultrafiltration takes place ?
b) Which structure contains the lowest concentration of urea ?
c) Which structure contains the highest concentration of urea ?
d) Which structure (normally contains the lowest concentration of the glucose ?
e) where is the most water reabsorbed ?
8) The following diagram is that of a human brain. Guidelines 1 to 5 indicate different parts of the surface of the brain and these are as follows:
A) frontal lobe of cerebrom 2) Temporal lobe of cerebrum 3) Occipital lobe of cerebrum 4) Cerebellum 5) Medulla oblongota
Study the diagram and answer the following:
a) What handicaps would result from:
i) damage to part number 3 ?
ii) damage to part number 4 ?
b) Mention one main function of each of the parts numbered 1, 2 and 5.
9) A Well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. It was then set up as shown in the diagram and exposed to light for about 12 hours. At the end of the time, leaf X and leaf Y were tested for Starch. Study the diagram and answer the questions that follow:
i) Why was the plant initially kept in darkness for 24 hours ?
ii) What is the function of sodium hydroxide solution in the flask ?
iii) Select the correct leaf from the five available choices shown in the diagram as A,B,C,D,EA. Rewrite the correct answer by filling in the appropriate letter for the questions that follow:
a) After the starch test, leaf X would look like____
b) After the starch test, leaf Y would look like _____.
iv) The experimental with leaf Y shows that photosynthesis requires the presence of certain factors. Mention any one factor.
10) State one function of Medulla oblongota.
11) The following diagram represents a plants cell after being placed in a strong sugar solution. Guidelines 1 to 5 indicate the following:
1) cell wall 2) strong sugar solution 3) protoplasm 4) large vacuole 5) nucleus
Study the diagram and answer the question that follow:
a) What is the state of the cell shown in the diagram ?
b) Name the structure which acts as an selectively permeable membrane .
c) If the cell had been placed in distilled water instead of strong sugar solution which feature would not have been present ?
d) if the cell in the diagram possessed chloroplasts where would these he present ?
e) Name any one feature of this plant cell which is not present in animal cells.
12) The diagram shows part of the capillary bed in an organ of the mammalian body. Some of the blood arriving at the capillaries at the points labelled A moves out into spacer between the tissue cells.
Study the diagram answer the question that follow :
a) when the liquid from the blood is surrounding the cell, what is it called ?
b) Name any one important component of the blood which remains inside the capillaries and fails to move out in the spaces.
c) Some of the liquid surrounding the cells does not pass directly back into the blood but eventually reaches it by another route through vessel X. Name the fluid in vessel X
d) State two important functions performed in our body by the fluid present in vessel X.
12) Answer the following questions :
a) Name the endocrine cells present in the pancreas.
b) Name two hormones secreted by the above mentioned cells.
c) Mention one main function of each hormone named in (b).
13) The figure given below represents the female reproductive system of a mammal. Parts indicated by the guidelines A to D are as follows:
A. uterus B. fallopian tube(oviduct) C. Ovary D. vagina
grive appropriate terms for each of the following:
a) the onset of reproductive phase in a young female.
b) Rupture of follicle and release of ovum from the ovary.
c) Monthly discharge of blood and disintegrated tissues in human female.
d) Process of fusion of ovum and sperm. .
e) Fixing of developing zygote (blastocyst) on the uterine wall.
14) Differentiate between members of each of the following pairs with reference to the phrases in brackets:
a) osmosis and diffusion (flow of solvent molecules).
b) myopia and hyperpatria (cause of the defect )
c) Glycolysis and Kreb's cycle(reaction site of the process in a cell).
d) Artery and vein (direction in the blood flow)
ABSORPTION AND MOVEMENT OF FLUID IN PLANTS
1) Give four major uses of water in the plant.
2) Briefly discuss three features of roots which make them suitable for observing water from the soil.
3) Choose the most appropriate alternative :
a) Diffusion can be defined as :
i) the movement of molecules from one place to another.
ii) the passage of water molecules from a dilute to a concentration solution through a semi-permeable membrane.
iii) the random momentum molecules.
iv) the tendency of molecules to distribute themselves evenly within the space they occupy.
b) Osmosis may be defined as the passage of:
i) water into the root hair cells of a living plant.
ii) a concentrated solution to a dilute solution through a semi-permeable membrane.
iii) water from a concentrated solution to a dilute solution through a semi permeable membrane.
iv) water from a dilute solution to a considered solution through a semi permeable membrane.
3) Name the process by which resins swelled up when placed in a beaker of water.
4) In an experiment two sets of apparatus A and B were set as shown in the figure below .
In A there is a concentrated sugar solution inside the thistle funnel. In B there is plane water both inside the thistle funnel as well as outside the funnel, as labelled. The experimentin was kept for about two hours.
a) What will happen to the level of fluids in A and B.
b) Name the process/es responsible for the changes mentioned in A above.
c) What is the cellophone supposed to represent?
d) What will be the taste of water in A after about six hours?
e) What is the purpose of setting up the second apparatus B ?
f) Define the process stated in (b) above.
5) In another experiment set-up a dye was placed in the bottom of a beaker filled with water as shown in figure A below.
After some hours the entire water in the beaker got coloured uniformly as shown in B.
a) Name the phenomenon shown in the experiment.
b) Figures C and D are diagrammatic representation of the two kinds of molecules In A and B respectively.
i) Label the molecules.
ii) What is solvent and what is solute .
c) Suppose all the dark shaded molecules in C were tightly enclosed in a 'cell membrane'. What shall be the nature of movement of the molecules , if any ?
6) Study the diagram below and explain the process indicated in the diagram:
7) What is meant by the following terms:
a) Turgidity
b) Plasmoo
c) Turgor pressure
d) Osmotic pressure
8) The figure alongside represents a root hair.
a) Label the parts indicated by guidelines .
b) State 3 ways how the root hair is adapted for the absorption of water and mineral salts .
c) How does water pass from the root-hair to the neighbouring cell ?
d) What part does the vacuole and the cell wall play in the process of absorption vacuole ?
d) What would happened to the root hair if the soil was watered with a highly concentrated solution of sodium chloride ? Give reasons:
9) The diagram below shows an experiment in which the phloem tissues of a plant were removed (ringed) and the xylem was left intact.
a) What would happen to the leaves above the cut portion of the stem ?
b) What was the purpose of the removal of the phloem tissue ?
c) Why should there be swelling above the 'ringed' area ?
d) Removal of the peripheral tissues will ultimately result in the death of the plant. Give reasons.
e) What would happen to the leaves if the xylem was removed instead of phloem ?
10) The apparatus shown below signifies an important process.
a) Name the process.
b) where does this process occur in plants ?
c) What solution is placed inside the dialysis tubing?
d) What happens to the level of the solution in the capillary tube?
e) Define the process mentioned in (a) above
11) One of the function of turgor pressure to the plant is that of support. This support by turgor is especially important in
a) the root of a young seedling.
b) the stem of submerged water plant.
c) the stem of a young seedling .
d) the steam of a tree in the wet season when water is easily available.
e) the stem of a tree in the dry season when water is in short supply.
12) Distinguish between each of the following pairs:
a) Exosmosis / Endosmosis
b) Plasmolysis / turgidity
c) Diffusion / Osmosis
d) Permeable membrane/ semipermeable membrane
e) Absorption by roots and root pressure
f) hypertonic solution/ Hypotonic solution
13) The figure below shows a sprouting seed in the soil.
a) Which part of the germinating seed has come out ?
b) How do the seed parts develop a force to push the soil up ?
14) What is root pressure?
15) Mention any one advantage which the plant derives from root pressure.
16) a) A living plant cell (A) was placed in a 5% salt solution. Draw a diagram (B) by its side, as it may appear after about 30 minutes.
b) Name the phenomena which has led to the condition in B.
c) What is the reverse of the phenomenon named above?
d) Which of the two conditions. A or B shows a turgid cell ?
17) Differentiate between "bleeding and Guttation" in plants.
18) Give equivalent terms for the following :
a) pressure of the cell content on the cell wall.
b) The condition in which cell contents are shrunken.
c) Loss of water through a cell membrane.
19) Select the correct answer
a) Osmosis occurs when
i) two solvents are mixed
ii) Two solution are mixed
iii) two solutions of different concentration are separated by a semipermeable membrane.
b) When a cell is placed in a hypertonic solution.
i) Exosmosis takes place
ii) endosmosis takes place.
iii) No osmosis takes place
c) Wooden doors and windows usually swell during the rainy season because they absorb water due to
i) Imbibition ii) Osmosis iii) Diffusion iv) Plasmolysis
d) In a Plasmolysis cell, the space between the cell wall and cell membrane is occupied by
i) internal solution
ii) external solution
iii) remains empty
e) Water absorption by the roots from the soil can only take place when the soil solution is
i) hypotonic to cell sap
ii) Hypertonic to cell sap
iii) Isotonic to cell sap Iv) none
f) Guttation in plants is indicative of
i) root pressure
ii) osmotic pressure
iii) Turgor pressure
g) Ascent of sap takes place through
i) phloem ii) Xylem iii) pith iv) cortex
h) If the Xylem vessels are blocked by wax, the plant will
i) Wilt ii) remain normal iii) show yellow leaves
19) An experiment was set up using a peeled potato (in which a cavity had been scooped out) as shown in figure A
Account for the change observed in figure B.
20) a) What was meant by water potential ?
b) Which one of the following has the highest water potential ?
i) milk i) 20% sugar solution iii) 20% salt solution iv) distilled water
TRANSPIRATION
1) Name the following :
a) The structure through which most of the transpiration takes place.
b) The evaporation of water from the aerial parts of the plant.
c) Chemical substances which are used to reduce the rate of transpiration.
d) The plants having sunken stomata.
e) The apparatus used to measure transpiration.
f) The time when stomata are closed generally.
g) The pores which are surrounded by two kidney -shaped guard cells and concerned with gaseous exchange.
2) Mention weather to following statements are true or false:
a) Gaseous exchange occurs in all body cells.
b) Transpiration reduces temperature of the plant.
c) Transpiration is reduced if the air outside is humid.
d) Moist Cobalt chloride paper is red in colour.
e) Transpiration is a psychological process.
f) More transpiration occurs from the upper surface of the leaves.
g) If the outside temperature is higher, there is less evaporation from the leaf.
3) Complete the following statement :
a) Potometer is an instrument for measuring the rate of____
b) Transpiration is highest during____
c) Most transpiration in a herbaceous plant like balsam occurs through___
d) Closing of stomata and shedding of leaves reduce____
e) 90% the total water is lost through ____
4) What is transpiration ? How is transpiration vital to the life of a plant ?
5) a) Describe the function of stomata in transpiration.
b) What is the function of the cuticle in transpiration ?
6) a) How does the suction of cell sap occur in the process of transpiration ?
b) What is the importance of suction due to transpiration in the life of a plant ?
7)a) What are the conditions which affect transpiration ?
b) State how each condition affects the rate of transpiration.
8) Differentiation between transpiration and Guttation .
9) How will you demonstrate that
a) water vapours are given off during transpiration.
b) Transpiration occurs at different rates from the two sides of a leaf.
10) What is a lenticular transpiration ? Mention one major difference between stomatal transpiration and lenticular transpiration ?
11) Explain scientifically why forests getting more frequent rains.
12) Why are the stomata found more numerous on the lower surface of the leaf ?
13) What is wilthing ? Some plants show wilting during day time even though the soil is well water. Why is it so.
14) Blowing wind can be useful to the plants in many ways. Mention any three such users giving suitable examples whenever possible.
15) Plant leaves contain stomata and human skin contains sweat pores. Mention any two differences in their functioning .
16) The figure show Ganong's Potometer.
a) wrhat is the purpose of this instrument ?
b) What are the three major factors that accelerate the transpiration ?
c) Mention any three provisions by which the plants tend to reduce transpiration ?
17) The following diagram demonstrates the process of transpiration in plant.
a) What do the arrows indicate which are shown on the sides of the leaves ?
b) What does the arrow indicates which is shown alongside the tube ?
c) How is transpiration different from evaporation ?
d) Give two advantages of transpiration to the plant.
18) The figure alongside represents an experiment to demonstrate certain phenomenon in plants.
a) What is the aim of the experiment?
b) Define the process mentioned .
c) What do you observe in the experiment as an evidence of the process ?
19) Given below is the diagram of an experimental set up to study process of transpiration in plants. Study the same and then answer the questions that follow :
a) What is the colour of the dry Cobalt chloride paper ?
b) Is the experimental leaf a monocot or a dicot ? Give a reason to support your answer.
c) Why are glass slides placed over the dry Cobalt chloride papers ?
d) After about half an hour what change, if any, would you expect to find in the Cobalt chloride paper placed on the doorsal and ventral side of the leaf ? Give a reason to support your answer.
20) Study the diagram given below and answer the questions that follow:
a) Name the process being studied in the above experiment.
b) Explain the process mentioned in (a) above.
c) Why is oil placed over Water ?
d) What do we observe with regard to the level of water when the setup placed in (1) bright sunlight (2) humid conditions (3) windy day ?
e) Mention any three adaptations found in plants to overcome the process mentioned in (a) above
1) The gastric juice secreted by the walls of the stomach contains:
a) sulphuric acid b) hydrochloric acid c) nitric acid d) acetic acid
2) When the equal volumes of hydrogen gas and chlorine gas are exposed to diffuse sunlight, the reaction:
a) does not takes place b) takes place at at moderate speed c) is explosive in nature d) none
3) In the preparation of hydrogen chloride gas from common salt the acid used is:
a) dilute sulphuric acid b) glacial Acetic acid c) conc. sulphuric acid d) carbonic acid
4) In the preparation of hydrogen chloride gas in laboratory, the reaction mixture should be:
a) kept below 10°C b) kept below 200°C c) kept above 200°C d) any of these
5) The drying agent used in the laboratory the preparation of dry HCL gas is:
a) Phosphorus pentoxide b) anhydrous calcium sulphate c) calcium oxide d) conc. sulphuric acid
6) The salt formed when sodium chloride and conc. Sulphuric acid are heated below 200°C is :
a) sodium hydrogen sulphate b) sodium sulphate c) sodium bisulphate d) either a or c
7) In order to find that a given jar is filled with HCl gas, a glass rod dipped in ____ solution is held near its mouth.
a) ammonia b) caustic soda c) caustic potash d) barium chloride
8) Hydrogen chloride gas is collected :
a) by the upward displacement of air b) downward displacement of air c) downward displacement of water d) over the mercury
9) HCL gas extremely soluble in water. One volume up water at 20°C can absorb:
a) 200 volumes of HCL b) 450 volumes of HCL c) 150 volumes of HCL d) 800 volumes of HCL
10) HCl gas turns alkaline phenolphthalein solution from:
a) pink to green b) pink to blue c) pink to colourless d) pink to yellow
11) The advantage of using inverted funnel for the absorption of HCl gas in water is:
a) it prevents back suction into the reaction mixture
b) it provides large surface area of water for absorption
c) it prevents explosion in apparatus d) both a and b
12) A non metallic hydroxide, which forms dense white fumes with HCl gas is compound of:
a) nitrogen and hydrogen b) nitrogen and oxygen c) nitrogen and carbon d) nitrogen and sulphur
13) A metallic carbonates react with dilute hydrochloric acid to form theit respective :
a) chlorides and water b) chloride and carbon dioxide gas c) chlorides, water and carbon dioxide gas d) none
14) When dilute HCl is mixed with clear solution of silver nitrate, a precipitate is formed which is:
a) yellow in colour b) silvery in colour c) curdy white in colour d) blue in colour
15) Aqua region is a mixture of:
a) 3 parts of conc. HCL and 1 part of conc. HNO₃
b) 1 part of conc. HCL and 3 parts of conc.HNO₃
c) equal parts of conc. HCL and conc. HNO₃ d) none
16)) Black copper(II ) oxide is placed in a beaker containing hydrochloric acid. After 1 hour the colour of reaction mixture changes to:
a) grey b) brown c) red d) blue
17) A chemical/chemicals which can dissolve gold is:
a)! Aqua Fortis b) aqua regia c) aqua pure d) none
18) An acid commonly applied on the surface of metal before soldering or welding is:
a) conc. sulphuric acid b) conc. nitric acidic c) conc. acetic acid d) conc. hydrochloric acid
19) The common name of hydrochloric acid is :
a) Marine acid b) muriatic acid c) solution of HCl d) none
20) Traces of hydrochloric acid is present in:
a) pancreatic juice b) gastric juice c) bile secreted by liver d) none
21) When equal volume of a mixture of hydrogen and chlorine are exposed to direct sunlight, they:
a) do not react b) react at a moderate speed c) react violently d) none
22) The acid with reacts with metallic chlorides, either without heating or with heating is:
a) conc. Nitric acid b) glacial acetic acid c) dilute sulphuric acid d) conc. Sulphuric acid
23) conc. dilute sulphuric acid react with the Iron (II) chloride on heating to form:
a) iron(II ) sulphate and HCL only b) iron(II ) sulphate, water and HCL only c) iron(III ) sulphate and HCL gas only d) iron(III ) sulphate, water and HCL gas only
24) concentrated or dilute sulphuric acid does not react with lead chloride, because:
a) lead is lower than hydrogen in electrochemical series
b) lead is higher than the hydrogen in electrochemical series
c)!an insoluble thin layer of lead sulphate is found over lead chloride , which cuts off chemical reaction d) none
25) In laboratory , hydrogen chloride gas is prepared by heating conc. H₂SO₄ with:
a) potassium chloride b) magnesium chloride c) sodium chloride d) ammonium chloride
26) Sodium chloride is used in the preparation of hydrogen chloride gas because:
a) it is cheapest chemical b) it is readily available c) it reacts readily with conc. H₂SO₄ even without heating d) all of these
27) The sodium chloride and conc. Sulphuric acid mixture should not be heated beyond 200°C, because:
a)! sodium sulphate so formed fuses with glass apparatus and makes it useless
b) rate of evolution of HCl gas is very high and hence it is difficult to collect
c) the apparatus may crack because sodium sulphate acts as a bad conductor of heat
d) all of these
28) During the laboratory preparation of hydrogen chloride gas from common salt and conc. H₂SO₄, the salt formed is sodium hydrogen sulphate, only when the temperature of mixture is:
a) 300°C b) 250°C c) 220°C d) below 200°C
29) Hydrogen chloride gas is heavier than air because its vapour density is:
a) 17.75 b) 18.25 c) 36.5 d) 22
30) 1 volume of water at room temperature will absorb :
a) 750 c.c of HCl gas b) 200 c.c of HCl gas c) 450 c.c of HCl gas d) 650 c.c of HCl gas
31) Hydrogen chloride gas is dried by bubbling it through conc.H₂SO₄ because:
a) HCl gas does not react chemically with conc.H₂SO₄
b) conc. H₂SO₄ being dehydrating agent absorbs moisture present in the HCL gas
c) conc.H₂SO₄ is least volatile acid and hence it's vapours do not mix with HCl gas.
d) all of these
32) An Alkaline solution which gives dense white fumes with HCl gas is :
a) sodium hydroxide b) potassium hydroxide solution c) ammonium hydroxide solution d) calcium hydroxide solution
33) When silver nitrate solution is treated with hydrochloric acid a thick curdy white precipitate of silver chloride is formed. This white precipitate dissolves in excess of:
a) sodium hydroxide solution b) ammonium hydroxide solution c) potassium hydroxide solution d) calcium hydroxide solution
34) When hydrochloric acid is added in lead nitrate solution, then a precipitate of lead chloride is formed which is :
a) white in colour b) light yellow in colour c) reddish brown in colour d) deep yellow in colour
35) The precipitate lead chloride in question 34 (above) along with rest of the reaction mixture is boiled. It is seen
a) percipetate changes to orange colour
b) no changes takes in precipitate
c) precipitate redissolves and a colourless liquid is formed d) none
36) The solution of nitrate/s of a metal/s which form white precipitate with dil. HCl are:
a) Zn(NO₃)₂ sol. b) Pb(NO₃)₂ sol. c) AgNO₃ d) both b and c
37) A salt of sodium which on boiling with conc. HCl gives reddish brown fumes of nitrogen gas is :
a) Na₂S b) NaHCO₃ c) Na₂SO₄ d) NaNO₃
38) When calcium hydrogen carbonate is treated with dilute HCl , the products formed are:
a) calcium chloride and water
b) calcium chloride and carbon dioxide
c) calcium chloride, water and CO₂ gas
d) calcium chloride, water and carbon monoxide gas
39) Which is not a correct statement?
When Na₂CO₃ is treated with dilute hydrochloric acid ?
a) a lot of effervescence takes place
b) carbon dioxide gas evolved
c) carbon dioxide and carbon monoxide gas evolved
d) both a and b
40) Iron savings reacts with dilute hydrochloric acid to form:
a) iron(II) chloride and water b) iron(II ) chloride and hydrogen c) Iron(III ) chloride and hydrogen d) Iron (III) chloride and water
41) In a beaker containing dilute HCl is poured 2g of black copper oxide(II ). The beaker is left undisturbed for one hour. After this time interval the colour of reaction mixture is:
a) colourless b) light green c) blue d) yellow
42) The products formed when magnesium sulphide is treated with dil. HCl are:
a) magnesium chloride and hydrogen gas
b) magnesium chloride and sulphur
c) magnesium chloride and hydrogen sulphide gas d) none
43) The product formed when potassium hydroxide sulphide (KHS) is treated with dilute HCl are:
a) KCL and sulphur b) KCL, water and sulphur c) KCL, H₂S and water d) KCL and H₂S gas only
44) The products formed when potassium hydrogen sulphite[KHSO₃] is treated with dilute HCl are:
A) KCL and sulphur b) KCL, water and sulphur c) KCL, SO₂ gas and water d) KCL, H₂S gas and water
45) The products formed when zinc sulphite is treated with HCl are:
a) zinc chloride and SO₂ gas b) zinc chloride and SO₃ gas c) zinc chloride, SO₂ gas and sulphur d) zinc chloride, SO₂ gas and water
46) The products formed when sodium thiosulphate solution is mixed with dilute hydrochloric acid are:
a) sodium chloride, water and SO₂ gas
b) sodium chloride, water and sulphur
c) sodium chloride, water, SO₂ gas and sulphur
d) sodium chloride, SO₂ gas and sulphur
47) When copper nitrate crystals are boiled with conc. HCl, the products formed are:
a) copper(II ) chloride and water
b) copper(I ) chloride and nitric acid
c) copper(II ) chloride and nitric acid
d) copper (II) chloride, water and nitric acid
48) When MnO₂ boiled with conc. HCl, the products formed are:
a) manganese chloride and water
b) manganese chloride and chlorine
c) manganese chloride, water, chlorine d) none
49) When lead dioxide is boiled with conc.HCl, the product formed are:
a) lead (II) chloride and water
b) lead(IV ) chloride and chlorine
c) lead(II ) chloride and chlorine
d) lead+II ) chloride, water and chlorine
50) When red lead oxide [Pb₃O₄] is boiled with conc. HCl, the products formed are:
a) lead(II ) chloride and chlorine b) lead(IV ) chloride and chlorine c) lead (II) chloride and water d) lead(II) chloride, water and chlorine
51) When potassium permanganate [KMnO₄] is treated conc. HCL, the product of reaction are:
a) potassium chloride, manganese chloride and water
b) potassium chloride, manganese chloride and chlorine gas
c) potassium chloride, manganese chloride, water and chlorine gas
d) none of these
52) When potassium dichromate(K₂Cr₂O₇) is boiled with conc.HCl, the products of reaction are:
a) potassium chloride, chromium chloride and water
b) potassium chloride, chromium chloride and chlorine gas
c) potassium chloride, chromium chloride, water and chlorine gas
d) none of these
53) Which is not a correct statement ?
Hydrochloric acid is used in:
a) the manufacture of dyes, drugs and paints
b) soldering and welding of metal
c) food preservative industry
d) leather industry
54) The aim of fountain experiment is to prove:
a) HCL turns blue litmus red
b) HCl is denser than air
c) HCl is highly soluble in water
d) HCL fumes in moist air
1) Identify the following :
a) Name of experiment which shows that hydrogen chloride gas is extremely soluble in water.
b) A gas liberated when dilute hydrochloric acid is treated with magnesium.
c) A coloured gas which reacts with hydrogen gas to form hydrogen chloride gas.
d) A gas liberated when calcium hydrogen carbonate is treated with dilute hydrochloric acid.
e) A white percipitate formed when sodium chloride solution is treated with silver nitrate solution.
f) A concentrated acid (1 part) which forms aqua regia, when mixed with three parts of conc. Hydrochloric acid.
g) An element liberated when sodium thiosulphate solution reacts with dilute hydrochloric acid.
h) A salt of sodium on treating with dilute hydrochloric acid liberates Sulphur dioxide gas.
i) A nitrate of a metal (other than silvery nitrate), which forms while precipitate when treated with dilute hydrochloric acid.
j) Name the gas evolved when potassium sulphide is treated with dilute hydrochloric acid.
k) Name the gas evolved when hydrochloric acid is made to react with manganese dioxide.
l) Name an acid which on mixing with silver nitrate solution produces a white percipetate which is soluble excess of ammonium hydroxide .
m) Name the gas that is produced by the action of dilute hydrochloric acid on sodium sulphide.
2) Complete the following by choosing the correct answers from the bracket.
a) The common name for hydrochloric acid is ______.(Muriatic acid/Aqua Fortis)
b) The traces of hydrochloric acid are present in ____.(pancreatic juice/ gastric juice)
c) Hydrogen gas and chlorine gas react____ when exposed to direct sunlight.(slowly/ explosively)
d) All metallic chlorides on heating with concentric____liberate hydrogen chloride gas.( nitric acid/sulphuric acid)
e) In laboratory hydrogen chloride gas is prepared by heating_____with conc. Sulphuric acid.(calcium chloride/sodium chloride)
f) During the preparation of hydrogen chloride from common salt and concentric Sulphuric acid, the salt formed is sodium hydrogen sulphate, if the reaction mixture is kept _____200°C (above/below)
g) Hydrogen chloride is collected by the upward displacement of air because its vapour density is____ as compared to air being 14.4. (36.5/18.5)
h) 1 volume up water at room temperature absorbs____ volumes of hydrogen chloride gas. (700/450)
i) Hydrogen chloride gas is dried by passing it through____. (Phosphorus pentoxide/conc. Sulphuric acid)
j) An alkaline solution which gives dense white fumes with hydrochloric acid gas is ____. (Sodium hydroxide/ammonium hydroxide)
k) Quicklime is not used to dry HCL because _____. (CaO is alkaline/ CaO is acidic/ CaO is a neutral)
l) potassium sulphite on reacting hydrochloric acid releases ____gas.(Cl₂/SO₂/ H₂S)
m) dry hydrogen chloride gas can be collected by _____displacement of air.(downward/ upward) is_____. (sodium hydrogen sulphate/sodium sulphate/chlorine)
n) The acid which cannot act as an oxidizing agent is _____.(Conc. H₂SO₄/conc. HNO₃/conc HCL)
3) Give balanced chemical equation for the following:
a) sodium thiosulphate and dilute HCl.
b) Calcium hydrogen carbonate and dilute HCl.
c) Concentrated hydrochloric acid and potassium permanganate crystals.
d) Action of dilute hydrochloric acid on sodium sulphide.
e) Action of hydrochloric acid on sodium bicarbonate .
f) Action of dilute hydrochloric acid and magnesium sulphite.
g) Action of dilute hydrochloric acid on iron.
4) State one Relevant Observation for each of the following:
1) When dilute hydrochloric acid is added to sodium carbonate crystals.
2) Action of dilute hydrochloric acid on iron(II) sulphide.
3) Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
4) A small piece of zinc is added to dilute hydrochloric acid.
5) Dilute hydrochloric acid is added to silver nitrate solution.
6) hydrogen chloride gas fumes in moist air.
2 Marks questions
1)a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid ?
b) What property of hydrogen chloride is demonstrated when it is collected by the downward)?
2) Write balanced chemical equations for the following the reactions:
a) zinc and dilute hydrochloric acid.
b) calcium bicarbonate and dilute hydrochloric acid.
3) What is observed when dilute hydrochloric acid is added to silver nitrate solution.
a) Name the experiment illustrated above.
b) Which property of hydrogen chloride is demonsrated by this experiment ?
5) a) What happens when dilute hydrochloric acid is added to lead nitrate solution ?
b) Write a balance chemical equation for the action of dilute hydrochloric acid on sodium sulphite.
6) Study the figure given below and answer the questions that follow:
a) Identify the gas Y.
b) What property of gas Y does the experiment demonstrate ?
7) a) Name two acids used in the formation of Aqua regia.
b) What is the ratio of these acids ?
8) In the laboratory preparation of HCl gas from sodium chloride, state, why the following are preferred.
a) conc. H₂SO₄ as reactant.
b) temperature of the reaction mixture below 200°C.
9) The diagram shows a simple arrangement of the fountain experiment:
a) Name the two gases you have studied which can be used in this experiment.
b) What is the common property demonstrated by this experiment?
10) Give an equation of HCl gas by synthesis. State to condition involved in its synthesis.
11) Why are conventional drying agent such as calcium oxide and Phosphorus pentoxide not used for drying moist HCl? Give equations
12) Name two soluble nitrates which can be converted into insoluble chlorides by the use of dilute HCl. Support your answer by chemical equations .
3 Marks Questions
1) The diagram shows an apparatus for the laboratory preparation of hydrogen chloride
a) Identify A and B
b) Write the equation for the reaction.
c) How would you check whether or not the gas jar filled hydrogen chloride ?
2) To a solution of hydrogen chloride, the following substances are added separately in small portions . Copy and complete the table given below.
No. Substance added Gas evolved odour
1. Sodium sulphite ----- ____
2. Calcium carbonate ____ ___
3. Magnesium ribbon. ____. _____
3) In and the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.
a) Draw a diagram to show the arrangement used for the absorption of HCl in water.
b) Why is such an arrangement necessary? giuve two reasons.
c) Write the chemical equations for the laboratory preparation of HCl gas when the reactants are:
i) below 200°C
ii) above 200°C
4) Answer the following questions pertaining The laboratory person hydrogen chloride.
a) Write an equation for the laboratory refraction of hydrogen chloride.
b) Name the drying agent used.
c) Name the method of collecting hydrogen chloride gas.
5) When concentrated hydrochloric acid is treated with potassium permanganate crystal a greenish yellow gas is given out.
a) Name the gas evolved
b) Write fully balanced chemical equation for the reaction.
c) Is hydrochloric acid acting as oxidizing agent or reducing agent?
6) Hydrogen chloride gas is prepared in the laboratory using concentrated sulphuric acid and sodium chloride. Answer the questions that follow based on the reaction:
a) Give the balanced chemical equation for the reaction with suitable condition/s if any.
b) Why is concentrated sulphuric acid used instead of concentrated nitric acid ?
c) How is the gas collected ?
7) How will you obtain the following from dil. HCL acid ? Given equation
a) hydrogen
b) carbon dioxide
c) sulphur dioxide.
8) a) Hydrogen is burn in a greenish yellow gas A then another gas B is formed . The gas B gives dense white fumes with ammonia liquor . Name the gas A and B.
b) Write the chemicals equations in support of your answer in (a).
9) what is an Aqua regia? How does it help in dissolving gold or platinum? Support your answer with chemical equations.
10) Write balanced chemical reaction for the reaction of dilute hydrochloric acid with each of the following:
a) iron
b) sodium hydrogen carbonate
c) iron (III) sulphide
11) The diagram shows an apparatus for the laboratory preparation hydrogen chloride.
a) identify A and B.
b) Write the equation for the reaction.
c) How would you check whether or not the gas is filled with hydrogen chloride ?
12) a) Name the acid used for the preparation of hydrogen chloride gas in the laboratory. Why is this particular acid preferred to other acids ?
b) Write the balanced chemical equation for the laboratory preparation hydrogen chloride gas.
b) For the preparation of hydrochloric acid in laboratory:
i) Why is direct absorption of hydrogen chloride gas in water not feasible ?
ii) What arrangement is done to dissolve hydrogen chloride gas in water ?
