Question

Why is concentrated hydrochloric acid not used for hydrogen preparation?

Answer 1

Answer:

Nitric acid not used in the laboratory preparation of hydrogen. This is because nitric acid is a strong oxidising agent, and oxidises hydrogen gas to convert it into the water. While dil. sulphuric acid and dilute hydrochloric acid do not oxidise hydrogen into water hence preferred for the preparation of hydrogen gas.

Answer 2

Answer:

nitric acid is not used in the preparation of hydrogen because nitric acid is a powerful oxidizing agent which on reaction forms nacent oxygen [O] which further reacts with hydrogen [H2] to form water

Explanation:

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