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Question
Cold, dilute nitric acid reacts with copper to give ______.
Options
Sulphur dioxide
Nitrogen dioxide
Nitric oxide
Sulphuric acid
Hydrogen
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Solution
Cold, dilute nitric acid reacts with copper to give nitric oxide.
Explanation:
Cold, dilute nitric acid acts as an oxidizing agent and reacts with copper to form copper nitrate, water, and nitric oxide gas (NO).
\[\ce{3Cu + 8HNO3(dil{.} -> 3Cu(NO3)2 + 2NO + 4H2O)}\]
The nitric oxide formed is colourless, but on exposure to air it gets oxidised to reddish-brown nitrogen dioxide (NO2).
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