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Hydrogen from Acids

Why is nitric...

Question

Why is nitric acid not used in the preparation of hydrogen ?

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Solution

It is because nitric acid is a strong oxidising agent (because it decomposes to yield nascent oxygenas:

$2 H N O_{3} ⟶ 2 N O_{2} + H_{2} O + [O]$

and it oxidises the hydrogen formed to water.Only 1% dilute and cold nitric acid reacts with magnesium and manganese to liberate Hydrogen gas.

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Nitric acid, even in its diluted form, is not used in the preparation of hydrogen from metals because metals on reaction with nitric acid can't replace the hydrogen atom.

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Hydrogen from Acids

Standard IX Chemistry

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