Question

14. When metal X s treated with cold water , it gives a base Y with the molecular formula XOH. (Molecular mass =40) and liberates a gas Z which burns with a pop sound. Identify X,Y,Z.

Answer 1

Answer:

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

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

It is clear that X is sodium, Y is sodium hydroxide and Z is hydrogen. The reaction can be shown by following equation: 2Na+2H2O→2NaOH+H2+Heat

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