generally when metals are treated with mineral acids, hydrogen gas is liberated but when metals(except M and MN) treated with dil. HNO3, hydrogen is not liberated, why?
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Answer:
Most of the metals do not react with HNO
3
because nitric acid is a strong oxidising agent. Hence, when metals (except Mn and Mg) are treated with nitric acid; hydrogen gas is not liberated.
Mg+2HNO
3
→Mg(NO
3
)
2
+H
2
Oxidation no. of Mg changes from 0 to +2 hence loss of electron which implies that HNO
3
oxidises Mg. Mg is but a reducing agent which changes oxidation no. of H from +1 to 0, hence H is released due to reducing nature of Mg & not HNO
3
.
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