Cu reacts with HNO₃ to evolve which gas ?

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N₂

N₂O

NO₂

answer is B.

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Detailed Solution

When copper is reacted with dilute Nitric acid it yields copper nitrate, water and Nitric oxide.
$3 Cu + 8 {HNO}_{3} (dil) ⟶ 3 Cu {({NO}_{3})}_{2} + 4 H_{2} O + 2 NO ↑$
Nitric oxide

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