A) Choose the correct alternative
a) conc. sulphuric acid b) Calcium oxide c) Phosphorus pentoxide d) all of these
2) The degree of ionization of an acid is called:
a) strength of an acid b) concentration of an acid c) combining capacity of an acid d) both a and b
3) The property of salts, giving up water of crystallization to the atmosphere is
a) Deliquescences b) hybroscopic c) efflorescence d) none
4) The property of salts of absorbing moisture from the air and then changing to liquid state is:
a) Deliquescences b) hybroscopic c) efflorescence d) none
5) The property of salts of observing moisture from air, but do not change into liquid state is:
a) Deliquescences b) hybroscopic c) efflorescences d) none
6) A salt which is amphoteric in nature is:
a) ZnO b) CuO c) Fe₂O₃ d) CaO
7) Which of the following forms acidic solution in water ?
a) CuSO₄ b) ZnSO₄ c) K₂SO₄ d) both a and b
8) Ammonium hydroxide solution is:
a) alkaline in nature b) acidic in nature c) neutral in nature d) none
9) Ammonium sulphate solution is:
a) alkaline in nature b) acidic in nature c) neutral in nature d) none
10) Sodium carbonate solution is:
a) alkaline in nature b) acidic in nature c) neutral in nature d) none
11) Sodium sulphate solution is:
a) alkaline in nature b) acidic in nature c) neutral in nature d) none of these
12) Copper sulphate solution is:
a) alkaline in nature b) acidic in nature c) neutral in nature d) none of these
13) An oxide of a nonmetal used for making soft drinks is:
a) SO₂ gas b) CO gas c) NO₂ gas d) CO₂ gas
14) A soluble metallic compound with H⁺(aq) ions of an acid to form a salt in water as only products is:
a) alkali b) base c) basic salt d) none of these
15) An acid salt is:
a) Potassium hydrogen sulphate b) potassium hydrogen carbonate c) magnesium hydrogen carbonate d) all of these
16) an inorganic acid amongst the following is:
a) Acetic Acid b) formic acid c) hydro-cyanic acid d) oxalic acid
17) A tribasic acid is:
a) H₂SO₃ b) H₃PO₄ c) HNO₃ d) CH₃COOH
18) The salt which forms neutral solution in water is:
a) sodium sulphate b) ammonium chloride c) copper sulphate d) silver nitrate
19) a salt which forms an acidic solution in water is:
a) sodium chloride b) ammonia carbonate c) silver nitrate d) potassium sulphate
20) A salt which forms basic solution in water.
a) CH₃COONH₄ b) CH₃COOK c) KCl d) NaNO₃
21) The base amongst the following compounds is :
a) sodium hydroxide b) potassium hydroxide c) copper hydroxide d) ammonium hydroxide
22) 2Al(OH)₃+ 3H₂SO₄ ---> Al₂(SO₄)₃ + 6H₂O
in the above chemical equation the acidity of Al(OH)₃ is:
a) 1 b) 6 c) 3 d) 2
23) The salt which forms a neutral solution is water is:
a) (NH₄)₂SO₄ b) Na₂SO₄ c) Na₂CO₃ d) Cu(NO₃)₂
24) the colour of pH paper in odourless solution of ph7 is
a) deep blue b) yellow c) green d) Orange
25) The colour of pH paper in limewater [Ca(OH)₂] is
a) green b) red c) blue d) Orange
26) Ammonium hydroxide is an example of
a) strong alkali b) weak alkali c) strong base d) none of these
27) Sodium nitrate is an example of:
a) normal salt b) acidic salt c) basic salt d) none of these
28) Sodium acetate(CH₃COONa) is an example of:
a) normal salt b) basic salt c) acidic salt d) none of these
29) pH of dil. H₂SO₄ is more than acetic acid. So Sulphuric acid has
a) greater concentration of H⁺ ions b) same concentration of H⁺ ions c) low concentration of H⁺ ions d) none of these
30) The base amongst the following hydroxides is:
a) sodium hydroxide b) ammonium hydroxide c) copper hydroxide d) potassium hydroxide
31) Zinc oxide dissolves in dilute hydrochloric acid as well as in conc. NaOH solution. The nature of zinc oxide is
a) acidic b) alkaline c) neutral d) amphoteric
32) The pH of a solution is 6. The pH of the solution can be increased by adding to it :
a) few drops of conc. KOH solution b) few drops of conc. HCL c) 1 ml of water d) none of these
33) A particular solution contains molecules and ions of a solute, so it is a
a) strong acid b) strong base c) weak acid d) sodium chloride solution
34) An example of a complex salt is:
a) copper sulphate b) potasium hydrogen sulphate c) iron(II ) ammonium sulphate d) tetra amine copper (II) sulphate
35) Acid is a compound, which on dissolving in water furnishes:
a) hydrogen ion b) hydroxil ion c) hydronium ion d) both a and c
36) An aqueous solution of hydrogen sulphide gas is a :
a) strong acid b) strong alkali c) weak alkali d) weak acid
37) Conc. nitric acid stains the skin:
a) black b) brown c) yellow d) red
38) Which is the base amongst the following ?
a) LiOH b) NaOH c) Mg(OH)₂ d) KOH
39) Which acid is the dibasic amongst the following ?
a) sulphuric acid b) sulphurous acid c) hydrogen sulphide solution d) all of these
40) Which is triacidic base?
a) Almunium hydroxide b) iron(II ) hydroxide c) ammonium hydroxide d) both a and b
41) degree of ionization of an acid X is 6%. The acid X is:
a) dilute acid b) concentrated acid c)?weak acid d) strong acid
42) the pH of solution is 1.2. The solution is :
a) Mildly acidic b) strongly acidic c) Mildly alkaline d) strongly alkaline
43) the pH of a colourless liquid is 13. The liquid is a :
a) very strong acid b) very strong alkali c) a weak acid d) a weak alkali
44) A solution turns pH paper blue. The pH paper is kept within the solution and another solution X is added drop by drop. It is found that pH paper turns green. The nature of solution X is:
a) Acidic b) alkaline c) neutral d) none of these
45) The metallic oxide which dissolved in water to form alkali is :
a) K₂O b) Al₂O₃ c) ZnO d) CuO
B) Identity the following:
1) A compound which on dissolving in water furnishes hydronium ion as the only positively charged ions.
2) An acid which furnishes 3 hydronium ions per molecules on ionization.
3) An Acid which undergoes partial dissociation, on dissolving in water.
4) A water soluble base, which furnishes hydroxyl ions.
5) The number of H⁺ ions of an acid which react completely with one molecule of base to form salt and water as only products .
6) An indicator which turns pink in alkaline solution and colourless in an acid solution.
7) A hydrated salt which loses its water of crystallization on exposure to air.
8) The phenomena due to which salt reacts with water to form parent acid and alkali.
9) A salt which absorbs moisture from air and changes into liquid state.
C) Complete the following by choosing the correct answers from the brackets:
1) A more volatile acid obtained, when a less volatile acid reacts with sodium nitrate is ___.( sulphuric acid/nitric acid)
2) an example of an acid derived from a mineral acid is ____.(acetic acid/citric acid/hydrochloric acid)
3) an example of a base which is not on alkali is ____.(caustic potash/ copper hydroxide/ ammonium hydroxide)
4) an example of a weak acid is____(HCl/H₂CO₃/HNO₃/H₂SO₄)
5) an example of a weak alkali solution is____.( sodium hydroxide/ potassium hydroxide/ammonium hydroxide)
6) An acid having a basicity 2 is ____(acetic acid/nitric acid/carbonic acid)
7) An example of insoluble salt is____.(Na₂SO₄/CuSO₄/PbSO₄/ZnSO₄)
8) an example of a salt which produces neutral solution on hydrolysis is____.( sodium acetate /sodium carbonate/sodium chloride)
9) An example of acidic salt is____,(NaHSO₄/CH₃COONa/K₂SO₄)
10) The colour of hydrated copper sulphate is____.( light blue/black /white)
11) the example of an amphoteric hydroxide is ____.(Ca(OH)₂/ Cu(OH)₂/ Al(OH)₃/Fe(OH)₃)
12) the hydroxide which is soluble in excess of NaOH is____. (Al(OH)₃/ Fe(OH)₂/ Cu(OH)₂)
13) an oxide of a metal which is amphoteric in nature is ____. (PbO/Pb₃O₄/PbO₂)
D) Match the Column A and column B
Column A. Column B
1) Acidic salt a) sodium Potassium carbonate
2) mixed salt b) Alum
3) complex salt c) sodium carbonate
4) double salt d) sodium zincate
5) normal salt e) sodium hydroxide carbonate
E) Write balanced equation for the following reactions
1) potassium hydrogen carbonate and dilute sulphuric acid.
2) copper oxide and dilute hydrochloric acid.
3) manganese(IV) oxide and concentrated hydrochloric acid.
4) Sulphur and hot concentrated nitric acid.
5) sodium nitrate and concentrated sulphuric acid.
F) Short questions (2)
1) Differentiate between hydracids and oxy-acids. Give examples.
2) On what basis are the strength of a) acids b) alkalis determined ?
3) differentiate between a strong acid and weak acid. Give two examples .
4) differentiate between a strong alkali and a weak alkali.
5) Explain why is the basicity of an acetic acid is one, and the acidity of magnesium hydroxide is 2.
6) How will you obtain a) Sulphuric acid from an acidic oxide b) potassium hydroxide from a basic oxide ?
7) write fully balanced chemical equations for the reaction of conc. Sulphuric acid with a) metallic chloride b) metallic nitrate, why the chloride and nitrate form their respective acids.
8) 1 molar solution of Acetic acid is a weak acid as compared to 0.1 molar solution of hydrochloric acid? Why? Explain your answer.
9) Give one chemical property (not indicators) with a balanced equation in each which are typical of a) dilute acid b) a dilute aqueous alkalis.
10) Mention the terms defined by the following sentences:
a) A soluble base.
b) An insoluble solid formed, when two solution are mixed together.
G) 3 Marks Questions
1) Why is sulphuric acid is a diabasic acid ? Give three reasons. Support your answer with equations, wherever possible.
2) State two chemical properties each with equations for
a) a strong solution containing ions solution containing H⁺ (aq) ions.
b) a solution containing OH⁻ ions.
3) Show ironically why
a) phosphoric acid
b) Sulphuric acid
c) Acetic Acid are called acids.
4) Define the following terms giving one example in each case
a) an acid
b) A base
c) An acid salt.
5) Zinc metal and Aluminium metal are amphoteric in nature. What do you understand by the statement ? Support your answer by writing fully balanced chemical equations.
6) Solution A is a strong acid
Solution B is a weak acid
Solution C is a strong alkali
a) which solution contains soluble molecules in addition to water molecules ?
b) which solution will give a gelatinous white precipitate with zinc sulphate solution ? The precipitate disappears when an excess of the solution is added.
c) Which solution could be a solution of glacial Acetic Acid ?
d) Give an example of a solution which is a weak alkali.
7) What is observed when :
a) Hydrogen sulphide gas is passed through the lead acetate solution ?
b) Neutral litmus solution is added to sodium hydrogen carbonate solution ?
c) a small piece of iron is placed in copper sulphate solution ?
8) a) Acids dissolve in water to produce positively charged ions. Draw the structure of these positive ions.
b) Explain , why carbon tetrachloride does not dissolve in water.
c) Elements Q and S react together to form an ionic compound. Under normal conditions , which physical state will the compound QS exist in .
d) can Q and S, both be metals ? justify your answer.
9) Write the observations and balanced equation for the following reaction:
a) sodium hydroxide is added drop by drop, till in excess, in a solution of zinc sulphate.
b) ammonium hydroxide is added first in small quantity and then excess to a solution of copper sulphate.
c) Excess of ammonium hydroxide is added to a substance obtained by the action of hydrochloric acid in silver nitrate.
10) Starting with copper chips and concentrated nitric acid, describe briefly how you can prepare black copper oxide.
11) For each of the conversion A, B, C, D and E in the scheme below, state briefly in words, how the conversions can be carried out.
12) Starting from potassium hydroxide and nitric acid, how will you prepare crystals of potassium nitrate ?
13) Briefly describe, how will you obtain crystal of zinc sulphate starting from zinc and dilute sulphuric acid.
14) Give one chemical test to distinguish between the following pairs of compounds.
a) Zinc sulphate solution and zinc chloride solution.
b) iron(II ) chloride solution and iron(III ) chloride solution.
c) Calcium nitrate solution and calcium chloride solution.
15) A solution M turns blue litmus red while another solution N turns red litmus blue. In the above context answer the following questions.
a) What does M must contain?
b) What does N must contain?
c) When M and N are mixed together, name one of the product formed .
d) when M and N are mixed together, name the other products formed.
e) If a piece of magnesium was put in to a solution M, name the gas evolved.
16) The pH value of 3 solution P, Q, R are the given in the table.
Solution pH value
P. 12
Q 2
R 7
Answer the followings:
a) Which solution will have no effect on litmus solution?
b) Which solution will liberate CO₂ when reacted with sodium carbonate?
c) Which solution will turn red litmus blue?
d) Which solution will turn blue litmus red?
e) Which solution is also known as alkali
17) Answer the following:
a) The pH of a solution S is 10. What is nature of solution ?
b) If the pH of solution is to be the increased name the compound we should add to it.
c) Name the kind of particles present in the solution of the sodium chloride.
d) Name kind of particles present in the solution of carbonic acid.
e) Name kind of particles present in the glucose solution.
18) You are provided with copper carbonate and concentrated sulphuric acid. How will you proceed to prepare hydrated crystals of copper sulphate ?
19) You are required to prepare lead sulphate from lead carbonate. Briefly explain how will you proceed.
20) We cannot prepare calcium sulphate by treating marble chips with dilute sulphuric acid. Outline the procedure to prepare calcium sulphate from marble chips.
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