DAILY REVISION (CHEMISTRY) (X)

13/5/22

1) State what is mean by the term 'periodic properties' of elements.

2) explain the meaning of the following terms :

A) atomic size

B) Ionization potential.

C) electron affinity.

D) electronegativity.

 state the factors which influence or affect each of the above periodic properties stated in above.

3) state two differences in nature or properties between elements of group IA and VIIA.

4) Name the following:

A) An element in period 3 whose electron affinity is zero.

B) an alkali metal other than Sodium and potassium.

C) the group in the periodic table which has three vertical columns.

D) An alkaline earth metal.

E) an element in period-2 having zero valency.

5) Arrange the following elements as per the instructions in the bracket:

A) Boron, carbon, beryllium, Lithium (as per decreasing order of atomic size)

B) bromine, chlorine, fluorine, iodine (as per decreasing order of electron affinity)

C) Silicon, sulphur , aluminium, chlorine (as per increasing order of electronegativity).

6) Give reasons for the following:

A) electron affinity is considered a periodic property.

B) increase nuclear charge, increases the electron affinity of the element.

C) atoms with the high Ionization potential tend to gain electrons.

D) Ionization potential decreases down a group in the modern Periodic table.

7) A) Name the halogen in group 7A of period 3 of the periodic table.

B) give the electronic configuration of the halogen stated in A above

C) state the character of the oxide of the halloween stated in about is the halogen stated in A above

D) Is the halogen stated in A an oxidizing agent or reducing agent. Give reason for the same.

E) name a covalent hydride obtained from halogen.

F) name an electrovalent and a covalent compound formed between the halogen and a metal and the halogen and a neutral gas respectively.

G) Draw the electron dot diagram to represent a molecule of the halogen state in A above.

9/5/22

1) a) The element at the bottom of a group is expected to show__ metallic characters than the element at the top of a group (less/ more)

b) The similarities in the properties of elements in a group is because they have the same __ (electronic configuration, number of outer electrons).

c) The properties of elements are periodic function of their___ (mass number/Atomic number)

d) Moving across a___ of periodic table, the elements show increasing ____ character (group/ period/ metallic/nonmetallic)

2) Carbon(At no. 6) and nitrogen(At. no 7) belong to same period of periodic table. Write down the 

a) electronic configuration of carbon and the group to which it belongs.

b) electronic configuration of nitrogen and the group to which it belongs.

c) Name one more element which is in the same group as nitrogen.

3) a) how many periods are in Mendeleef's periodic table ?

b) how many groups are in Mendeleef's periodic table ?

c) how many groups consist of normal elements and Transition Elements in Mendeleef's periodic table.

d) Why were some gaps left in Mendeleef's periodic table?

4) 

I        II    III       IV     V    VI     VII       0

lith Car oxygen L                         neon

X                        E     G              Q

Y                                                R

Z                                                T

In the periodic table given above, lithium, carbon, Oxygen and neon are placed in their correct positions. The position of 9 other elements is represented by letters. These letters are not the symbols of elements concerned. Answer the following questions.

a) write the letter for most reactive metal.

b) write the letter for most nonmetal.

c) Name the family of elements represented L, Q, R, T.

d) Name one element in group II, III, V.

e) Name the elements represented by the letters E and G respectively.

f) Write the structural formula of chloride of E.

5) a) What is the position of the zero group in long form of periodic table?

b) which of the elements in the pairs given below will have smaller atomic size?

 i) sodium or magnesium

 ii) nitrogen nitrogen or Phosphorus 

c) With reference to second period of periodic table, name an element 

 i) which has the largest atomic volume ?

ii) Which has smallest atomic volume?

d) Atomic number of an element is 18.

 i) State the group number to which this element belongs.

ii) state the period of this element.

e) An element M has atomic number 19. Answer the following questions:

i) is the element a metal or a non metal

ii) is the element more reactive than calcium or less ?

iii) Write the formula of sulphate of the element.

6) The sentences given below are taken from the long form of Periodic Table. fill in the blank spaces with appropriate words from the list of words given below:

 List of words: lanthanides, separated, transition, normal, 18, zero, metallic, non-metallic.

a) the subgroups A and B are__ in this table.

b) The___ elements are accommodated in the middle of table.

c) there are ___vertical columns for long period.

d) the strongly___ elements occupy group IA and IIA respectively on the left transition elements.

e) The ___ elements are placed on right hand side of the transition elements.

f) The rare gases are placed in__ group at the end.

g) the elements occupying left and right wing groups of periodic table are called ___elements.

h) the actinides and ___ are kept outside the periodic table to Mark their particular properties.

7) Given below is the part of periodic table:

Li        Be       B        C      N      O       F

Na      Mg      Al       Si     P       S      Cl

a) How does metallic character of an element change as one moves from 

i) left to right in a period ?

ii) Top to bottom in a group?

b) How does the valency of elements change with respect to hydrogen as one moves from left to right in a period ?

c)i) what is the valency of the element Si ?

ii) will it form a covalent or electrovalent bond with hydrogen which is the most metallic ?

d) Which is the

i) Most metallic element in the above table ?

ii) most non metallic element in the above table?

e) By drawing a dot diagram show the reaction between the elements named in (4) (a) and (b).

22/4/22

1) A) State the element other than hydrogen in periodic I of the modern Periodic Table.

B) name the element present in period 3 which belongs to the same group to that of the element stated in (A) above.

C) State the electronic configuration of the element stated in (B) above

2)A) explain the term periodic properties

B) state the periodic property of an element which

 a) decrease on moving from left to right in a period.

 b) increases on moving down a group in a period.

3) Compare the elements of group IA with elements of group VII A with respect to

A) number a valence electrons.

B) valency.

C) conduction of electricity.

D) oxidising/ reducing nature.

E) metallic/non metallic character

20/4/22

1) A) State the number of non metallic elements in period 2 of the Modern Periodic Table.

B) Name the metalloid in period 3 of the Periodic Table.

C)  Which of the three elements- Beryllium, boron or Lithium has the largest atomic size.

D) State the group of Periodic Table to which the elements- Fluorine, chlorine and bromine belong.

2) A) Define the periodic property 'atomic size'. 

B) State why group 0 elements have electron affinity value '0'.

C)  State the trend in density of elements on moving across a period and a down a group.

3) Supply the missing word from those given in the brackets:

Elements in the same group of the Periodic Table have ___ (different/same) number of Valence Electrons, while elements of the same period have____ (same/different) number of electron shells.

4) What happens to the electronegativity on moving down a group in the periodic table.

19/4/22

1) Write the balanced equations for each of the following reactions involving an oxide.

A) Lead(IV) oxide and concentrated hydrochloric acid.

B) Lead(II) oxide(heated) and ammonia.

C) Zinc oxide and dilute nitric acid.

D) Sodium oxide in sulphur dioxide.

E) Iron (III) oxide and Aluminium.

2) Define the following periodic properties.

A) Ionization potential.

B) electronegativity.

3) State the following pertaining to the Periodic Table.

A) The period of the Periodic Table which has two elements in its period.

B) the period to which the element carbon belongs.

C) the element in period 2 with the highest ionisation potential.

D) the Nobel gas present in period two of the Periodic Table.

4) Supply the missing word/s in the blanks below.

A) Sodium is an____ metal belonging to group___ of the periodic table. It has___ electron/s in its valence shell and is a strong_____ agent.

BIOLOGY (Revision) (X)

1) Name the gland which secretes insulin.

2) name the part of the brain which is concerned with memory.

3) Write the function in one word:

A) white blood cell

B) kidney 

C) myelin sheath

D) spinal cord

4)a) The blood vessel which carries oxygenated blood to the heart is ____(aorta, pulmonary vein, pulmonary artery)

b) Myopia can be corrected by __(convex lens, concave lens, surgery).

5) Difference between

cerebrum and cerebellum (function)

6) a) Presbyopia is generally an age related eye defect. T/F

b) Deafness is caused due to rupturing of the pinna. T/F

c) Over secretion of thyroxine causes simple goitre. T/F

7) one man function of

A) ear ossicles

B) Irish

C) pituitary gland

8) Odd one out

a) spleen, Thymus, pancreas, tonsil

9) difference between 

A) blood plasma and serum

B) neuron and nephron

C) night blindness and colour blindness

10) draw a diagram of the human excretory system and lebel the following:

 A) renal Cortex, renal medulla, renal pelvis, ureter, urinary bladder, urethra.

B) List the main constituent of normal human urine.

C) name the blood vessel which enter and leave the kidney.

11) Explain:

A) Abnormally large numbers of WBCs in the blood is usually an indication of some infection in our body.

B) veins have valves at intervals in their inner lining whereas the arteries do not have valves.

C) Insulin is injected into the body of a highly diabetic patient and not given orally.

PHYSICS (Revised) (X)

1) Explain the difference between natural and forced vibrations of a given object.

2) A student makes a 'parallel combination' of a given number of cells. Cite one advantage and one disadvantage of this arrangement.

3) An electric heater of wattage 2kW and two light bulbs, of 60 W each, are kept 'on' for 5 hours. Find the cost of the electricity consumed if each 'unit' of electricity costs ₹2.00. 21.20

4) Why are we advised not to use wet hands for 'putting off' a switch? 

5) What is the importance of a 'fuse' in an electric circuit ?

6) Of which physical quantity is the 'kWh' a measure ? Calculate the value of 1 kWh in joule.

7) Name the three wires used in domestic wiring systems.

8) A stretched string is being made to vibrate in its 'fundamental frequency ' mode. Give two factors on which this fundamental frequency, of the vibrating stretched string, depends.

9) Soldiers are adviced to march 'out of step' while crossing bridges.

10) It is desired to find out the specific heat capacity of brass experimentally. For this purpose, 0.2 kg of hot water, at an initial temperature of 65°C, is poured into a heavy brass container of mass 1.5 kg. The brass container is initially at 15°C and gets heated up to 45°C, after pouring the hot water and stirring it well. The specific heat capacity of water is 4200 J/kg/°C.

A) How much heat energy does the hot water give out when it cools from 65°C to 45°C ? 16800 J

B) If the heat energy, released by the hot water, is totally used by the brass container, in raising its temperature from 15°C to 45°C, find the heat energy absorbed by it per degree Celsius rise in its temperature. 560 J/°C

C) What is the specific heat capacity of brass? 373.3 J kg(°C)

11) During the radioactive decay, a radioactive nucleus decays either by emitting an alpha particle or Beta particle. In both cases, it also simultaneously emits gamma rays.

A) Compare the ionising power of gamma radiation with that of alpha and beta particles.

B) How does the penetrating power of gamma rays compare with that of alpha and beta particles.

C) Do gamma rays gets deflected by electric or magnetic fields in the same ways as alpha or gamma particles get ?

D) what is the nature of charge, if any, of gamma radiation?

 

12) The isotope ²²⁶Ra₈₈ is known to decays through the emission of Alpha particles.

A) Find the change in the atomic number of the Radium nucleus when it emits an Alpha particle.

B) find the change in the mass number of the radium nucleus when it emits an Alpha particles.

C) When ²²⁶Ra₈₈ emits Alpha particles, which of the following elements is likely to be formed:

Polonium (Po₈₄); Astatine (At₈₅); Radon(Rn₈₆); Francium (Fr ₈₇ ).

C) What is the nature of

  i) alpha rays

 ii) Beta rays

 iii) gamma rays.