Acid Base Salt NCERT Exemplar problems mcqs-3

Acid Base and Salt

Exemplar Problems MCQ 3

Which of the following is used for dissolution of gold?

  1. Hydrochloric acid
  2. Sulphuric acid
  3. Nitric acid
  4. Aqua regia
    Answer: (d) Aqua regia

Which of the following is not a mineral acid?

  1. Hydrochloric acid
  2. Citric acid
  3. Sulphuric acid
  4. Nitric acid
    Answer: (b) Citric acid

Which among the following is not a base?

  1. NaOH
  2. KOH
  3. NH4OH
  4. C2H5OH
    Answer: (d) C2H5OH

Which of the following statements is not correct?

  1. All metal carbonates react with acid to give a salt, water and carbon dioxide
  2. All metal oxides react with water to give salt and acid
  3. Some metals react with acids to give salt and hydrogen
  4. Some non metal oxides react with water to form an acid
    Answer: (b) All metal oxides react with water to give salt and acid.

Match the chemical substances given in Column (A) with their appropriate application given in

Column A Column B
(A) Bleaching powder (i) Preparation of glass
(B) Baking soda (ii) Production of H2 and Cl2
(C) Washing soda (iii) Decolourisation
(D) Sodium chloride (iv) Antacid
  1. A—(ii), B—(i), C—(iv), D—(iii)
  2. A—(iii), B—(ii), C—(iv), D—(i)
  3. A—(iii), B—(iv), C—(i), D—(ii)
  4. A—(ii), B—(iv), C—(i), D—(iii)
    Answer: (c) A – (iii), B – (iv), C – (i), D – (ii)

Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?

  1. Red
  2. Yellow
  3. Yellowish green
  4. Blue
    Answer: (c) Yellowish green

Which of the following is(are) true when HCl (g) is passed through water?

  1. It does not ionise in the solution as it is a covalent compound.
  2. It ionises in the solution
  3. It gives both hydrogen and hydroxyl ion in the solution
  4. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule
  1. (i) only
  2. (iii) only
  3. (ii) and (iv)
  4. (iii) and (iv)
    Answer: (c) (ii) and (iv)

Which of the following statements is true for acids?

  1. Bitter and change red litmus to blue
  2. Sour and change red litmus to blue
  3. Sour and change blue litmus to red
  4. Bitter and change blue litmus to red
    Answer: (c) Sour and change blue litmus to red

Which of the following are present in a dilute aqueous solution of hydrochloric acid?

  1. H3O+ + Cl
  2. H3O+ + OH
  3. Cl + OH
  4. un-ionised HCl
    Answer: (a) H3O+ + Cl

Identify the correct representation of reaction occurring during chloralkali process

  1. 2NaCl(l) + 2H2O(l) ⇨ 2NaOH(l) + Cl2(g) + H2(g)
  2. 2NaCl(aq) + 2H2O(aq) ⇨ 2NaOH(aq) + Cl2(g) + H2(g)
  3. 2NaCl(aq) + 2H2O(l) ⇨ 2NaOH(aq) + Cl2(aq) + H2(aq)
  4. 2NaCl (aq) + 2H2O (l) ⇨ 2NaOH (aq) + Cl2(g) + H2(g)
    Answer: (d) 2NaCl (aq) + 2H2O (l) ⇨ 2NaOH (aq) + Cl2(g) + H2(g)


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