Question
Name the products formed when:
dilute $HNO_3$ is added to copper. 

Answer

Copper when reacts with dilute $HNO _3$ forms Copper nitrate, Nitric oxide and water.
$3 Cu +8 HNO _3 \longrightarrow 3 Cu \left( NO _3\right)_2+4 H _2 O +2 NO$

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