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Question

When a piece of X is added to a sodium hydroxide solution, a gas Y is produced. Identify X and Y.

A
X- Gold Y- Hydrogen
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B
X- Zinc Y- Hydrogen
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C
X- Charcoal Y- Carbon dioxide
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D
X- Aluminium Y- Carbon dioxide
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Solution

The correct option is B X- Zinc Y- Hydrogen
When strong bases like sodium hydroxide or potassium hydroxide react with metals like aluminium or zinc, it liberates 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.

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