Which of the following acid is not used in preparation of hydrogen gas?

Dilute hydrochloric acid

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Dilute nitric acid

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Dilute sulfuric acid

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Solution

The correct option is B
Dilute nitric acid

Nitric acid is not used in the preparation of hydrogen because it is a strong oxidizing agent (even in its dilute form) and oxidizes hydrogen gas to convert it into water. However, a dilute hydrochloric acid and dilute sulfuric acid do not oxidize hydrogen into water hence they are preferred for the preparation of hydrogen gas.

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