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Why did HNO3 doesn't not evolve …

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Why did HNO3 doesn't not evolve H2 gas with metals above hydrogen in a series

Posted by Sonukishore Kamat 5 years ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years ago

Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2). But magnesium (Mg) and manganese (Mn) react with very dilute HNO3 to evolve H2 gas.

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