A metal on reaction with an acid, liberates a gas which gives a pop sound when brought in contact with a flame. Identify the gas?

Oxygen gas

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Hydrogen gas

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Carbon dioxide gas

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Carbon monoxide gas

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Solution

The correct option is B
Hydrogen gas

Metals on reaction with forms salt and hydrogen gas. To test the hydrogen gas, a small fire/flame can be brought near to the hydrogen gas. The pop sound comes from the small explosion formed by the combustion of hydrogen with oxygen.

Metals + dilute acid = metal salt + hydrogen gas

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Question 33
Write a balanced chemical equation for each of the following reactions and also classify them.

(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

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