Question

# Cold, dilute nitric acid reacts with copper to form _____(hydrogen, nitrogen dioxide, nitric oxide).

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Hint: When nitric acid reacts with copper at two different temperatures then they will give two different types of products. These are frequently asked questions so try to remember perfectly.

Copper is oxidized by nitric acid and forms $C{u^{ + 2}}$ ions.
$4HN{O_3} + Cu \to Cu{(N{O_3})_2} + 2N{O_2} + 2{H_2}O$