Same chapter3 marksDifficulty: Medium
How is hydrogen collected in the laboratory and how is it tested?
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3 marksDifficulty: Medium
Why is hydrogen not usually prepared by the action of a metal on nitric acid?
Original Khojo Papers practice question — not from a past board paper.
Answer
Nitric acid is an oxidising agent, so instead of releasing hydrogen it oxidises the hydrogen produced to water and is itself reduced to oxides of nitrogen. The gas collected would therefore be an oxide of nitrogen and not hydrogen.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Very dilute nitric acid with magnesium or manganese is the only exception.
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