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Question

Which of the following gas is released when copper reacts with dil. nitric acid?


A

NO2

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B

NO

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C

N2O5

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D

N2

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Solution

The correct option is B

NO


Copper reacts with dil.HNO3 and liberates nitric oxide gas.

3Cu+8HNO3(dil)3Cu(NO3)2+2NO+4H2O

Copper reacts with conc. HNO3 and conc. H2SO4 and liberates nitrogen dioxide and sulphur dioxide respectively.

Cu+4HNO3(conc.)Cu(NO3)2+2NO2+2H2O

Cu+2H2SO4(conc.)CuSO4+SO2+2H2O


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