Question

why hydrogen gas is not evovled whwn zinc metal reacts with dilute HNO3

Answer 1

Nitric acid is a string oxidizing agent So as soon as hydrogen gas is formed in thereaction ... Thus nitric acid does not release hydrogen gas upon reaction with metals. ... Only Mn and Mg can do this with very dilute HNO3. ... Hydrogen gas is not evolved when nitric acid reacts with metals but magnesium and manganese.
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Answer 2

Metals like Al, Zn and Fe do not react either with cold or hot water but react withsteam. ... metals react with dilute acids to form its salt and hydrogen gas isevolved. ... acid chloride H2 gas is not evolved when a metal reacts with HNO3