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

True

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False

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Solution

The correct option is A
True

A metal reacts with water to give metal hydroxide and hydrogen gas. The reaction is given below.

$C a (g) + 2 H_{2} O (l) \to C a (O H)_{2} (a q) + H_{2} ↑$

In this case, calcium reacts less vigorously with water to form calcium hydroxide and hydrogen gas.

After the reaction is complete we observe that the metal floats in water because of the hydrogen gas which sticks to the surface of the metal.

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Similar questions

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.

C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O

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