When a piece of X is added to a sodium hydroxide solution, a gas Y is produced. Which of the following can be X and Y?

(a) X: Gold Y: Hydrogen
(b) X: Charcoal Y: Carbon dioxide
(c) X: Aluminium Y: Carbon dioxide
(d) X: Zinc Y: Hydrogen

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Question 18

Explain the following:

(a) Lime water turns milky on passing carbon dioxide gas into it.
(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.

(a) Name the acid formed when sulphur dioxide dissolves in water.

(b) Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.

The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is :

(a) carbon dioxide (b) hydrochloric acid (c) hydrogen sulphide (d) carbon disulphide

Q. Explain the following:

(a) Lime water turns milky on passing carbon dioxide gas into it.
Explain the following:

(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.

Write a balanced chemical equation for each of the following :

1. Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.

2. Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.

3. Methyl alcohol burns in air to form carbon dioxide and water.

4. Liquid hydrogen peroxide decomposes to give water and oxygen gas.

5. Aluminium hydroxide reacts with sulphuric acid to give ammonium sulphate and water.

6. Aluminium sulphate solution reacts with sodium hydroxide to form a precipitate of aluminium hydroxide.

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When a piece of X is added to a sodium hydroxide solution, a gas Y is produced. Which of the following can be X and Y? (a) X: Gold Y: Hydrogen (b) X: Charcoal Y: Carbon dioxide (c) X: Aluminium Y: Carbon dioxide (d) X: Zinc Y: Hydrogen

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When a piece of X is added to a sodium hydroxide solution, a gas Y is produced. Which of the following can be X and Y?

(a) X: Gold Y: Hydrogen
(b) X: Charcoal Y: Carbon dioxide
(c) X: Aluminium Y: Carbon dioxide
(d) X: Zinc Y: Hydrogen