An unknown substance X, reacts with water to produce a gas Y which burns with a pop sound. Identify X and Y.
*More than one option may be correct.

X = Lithium, Y = Hydrogen

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X = Carbon, Y = Hydrogen

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X = Calcium, Y = Hydrogen

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X = Nitrogen, Y = Nitrogen dioxide

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Solution

The correct option is C X = Calcium, Y = Hydrogen
Metals react with water to produce metal hydroxide and hydrogen gas.

Lithium + Water → Lithium hydroxide + Hydrogen gas

Calcium + Water → Calcium hydroxide + Hydrogen gas

Hydrogen gas burns with a pop sound when a burning splinter is brought near it.

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An unknown substance X, reacts with water to produce a gas Y which burns with a pop sound. Identify X and Y. *More than one option may be correct.

An unknown substance X, reacts with water to produce a gas Y which burns with a pop sound. Identify X and Y.
*More than one option may be correct.