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# When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire.** Identify X, Y and Z and also write the reaction involved.**

The salt is NaOH and its molar mass can be calculated as follows:

Na(23)+O(16)+H(1)=23+16+1=40

Hence, it is clear that

**X is sodium,****Y is sodium hydroxide**

Hydrogen is a highly inflammable gas and hence it easily catches fire.

Hence,

**Z is hydrogen.**The reaction can be shown by the following equation:

2Na + 2H

_{2}O→2NaOH + H_{2}+ Heat- Related Questions & Answers
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