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Question

Complete the following reaction
Cu + HNO3Cu(NO3)2 + H2O +

A
NO2
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B
NO3
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C
O2
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Solution

The correct option is A NO2
Cu(s) + 4HNO3 (conc) Cu(NO3)2(aq) + H2O(l) + NO2(g) The above reaction can be used to check whether the given sample of acid is nitric acid. In this reaction, pieces of Cu are treated with nitric acid. The yellow-brown fumes of NO2 released confirm the acid.
Except Mg and Mn, all other metals react with nitric acid to give H2O as one of the products, while Mg and Mn release H2 gas.

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