When a piece of X is added to a sodium hydroxide solution, a gas Y is produced that burns with a pop sound. Identify X and Y.

X- Zinc Y- Hydrogen

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X- Gold Y- Hydrogen

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X- Aluminium Y- Carbon dioxide

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X- Charcoal Y- Carbon dioxide

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Solution

The correct option is A X- Zinc Y- Hydrogen
Bases like sodium hydroxide or potassium hydroxide react with metals like aluminium or zinc to liberate hydrogen gas. Usually, non-metals and noble metals do not react with bases. Here, a piece of X should be metal zinc, and Y should be hydrogen gas.
$Zn(s)$ $+$ $2 NaOH(aq)$ $\to$ ${Na}_{2} {ZnO}_{2} (s)$ $+$ $H_{2} (g)$

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