Reason -dilute nitric acid cannot be used in the preparation of hydrogen
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Nitric acid cannot be used in the preparation of hydrogen because when hydrogen is evolved nitric acid vaporises and combines with the hydrogen gas evolved and it is very difficult to separate hydrogen vapours from those of nitric acid vapours .
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Dilute nitric acid cannot be used in the preparation of hydrogen, because Dilute nitric acid is a strong oxidizing agent in its nature.
Explanation:
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