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Generally, when metals are treated with ...

Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), are treated with `HNO_(3)`, hydrogen is not liberated, why ?

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It is because `HNO_3` is a strong oxidising agent. It oxidises the `H_2` produced to `H_2O` and it self get reduced to any of the oxides of the nitrogen like `NO_2,NO` etc.
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