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Question
A dilute acid B does not normally give hydrogen when reacted with metals but does give a gas when reacts with copper. Identify B. Write the equation with copper.
Solution
The dilute acid is nitric acid \[\ce{HNO3}\].
Reaction of dilute nitric acid with copper:
\[\ce{\underset{Copper}{3Cu} + \underset{acid}{\underset{Dil nitric}{8HNO3}} -> \underset{Copper nitrate}{3Cu(NO3)2} + \underset{monoxide}{\underset{Nitrogen}{2NO}} + 4H2O}\]
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