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Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals

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asked Jan 16, 2018 in Chemistry by sforrest072 (157,439 points) ● 60 ● 409 ● 931
edited Jan 25, 2018 by Vikash Kumar

Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg)are treated with HNO3, hydrogen is not liberated, why?

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answered Jan 16, 2018 by faiz (82,347 points) ● 6 ● 6 ● 11
selected Jan 25, 2018 by Vikash Kumar
 
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It is because HNO3 is a strong oxidising agent. It oxidises the Hq produced to H2O and itself get reduced to any of the oxides of the nitrogen, like NO2, NO, etc

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