Question
Hydrogen gas is not evolved when metals like copper, Zinc, iron etc react with dilute nitric acid.
✓
Answer
$(i)$ Nitric acid is a strong oxidizing agent. It oxidizes hydrogen $(H_2)$ to water.
$(ii)$ Hence, it oxidizes completely to form any of the nitrogen oxide and water.
$(iii)$ Hence, these metals do not produce $H_2$ gas when they react with dilute $HNO_3.$
E.g $Cu _{( s )}+4 HNO _{3( aq )} Cu \left( NO _3\right)_2+2 NO _{2(g)}+2 H _2 O$
$(ii)$ Hence, it oxidizes completely to form any of the nitrogen oxide and water.
$(iii)$ Hence, these metals do not produce $H_2$ gas when they react with dilute $HNO_3.$
E.g $Cu _{( s )}+4 HNO _{3( aq )} Cu \left( NO _3\right)_2+2 NO _{2(g)}+2 H _2 O$
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