Chemistry
Hydrogen is evolved by the action of cold dil. HNO3 on
- Fe
- Cu
- Mg
- Zn
Hydrogen
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Answer
Mg
Reason — Magnesium (Mg) and manganese (Mn) are the only metals that react with very dil. nitric acid to liberate hydrogen. The oxidizing action of the acid is much reduced due to its over dilution.
Mg + 2HNO3 ⟶ Mg(NO3)2 + H2 ↑
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