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Practice each question, then open the answer or worked solution.
Which of the following is used for dissolution of gold?
The answer is (d) Aqua regia
Explanation:
Gold is a noble metal which will not react even with strong acids, hence aqua regia, which is a mixture of Nitric and Hydrochloric acid in the ratio 1:3 is used for dissolution of gold.
Which of the following is not a mineral acid?
The answer is (b) Citric acid
Explanation:
Citric acid is the organic acid hence it is the answer
Which among the following is not a base?
The answer is (d) C2H5 OH
Explanation:
C2H5 OH is alcohol, not a base
Which of the following statements is not correct?
The answer is (b) All metal oxides react with water to give salt and acid
Explanation:
Metal oxides are basic in nature hence they give alkaline solution when dissolved in water.
Match the chemical substances given in Column (A) with their appropriate application given in Column (B)
| 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 |
The answer is (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? (You may use colour guide given in Figure 2.2
The answer is (c) Yellowish green
Explanation:
Here neutralization takes place between HCL and NaOH solution hence PH will remain neutral which will be in
the yellowish-green zone in PH paper.
Which of the following is(are) true when HCl (g) is passed through water?
(a) (i) only
(b) (iii) only
(c) (ii) and (iv)
(d) (iii) and (iv)
The answer is (c) (ii) and (iv)
Explanation:
HCL is a strong acid which ionizes completely in water to produce Hydrogen as well as Hydrogen and chlorine. Hydrogen produces combine with water molecules to give Hydronium ions.
Which of the following statements is true for acids?
The answer is (c) Sour and change blue litmus to red
Which of the following are present in a dilute aqueous solution of hydrochloric acid?
The answer is (a) H3O+ + Cl–
Explanation:
Acid produces Hydrogen which will combine with a water molecule to produce Hydronium ion.
Identify the correct representation of reaction occurring during the chloralkali process
The answer is (d) 2NaCl (aq) + 2H2O (l) → 2NaOH (aq) + Cl2 (g) + H2 (g)