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Question

What do you see when concentrated nitric acid is added to copper.

A
green coloured gas
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B
colourless gas
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C
reddish brown coloured gas
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D
yellowish coloured gas
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Solution

The correct option is C reddish brown coloured gas
Pinkish red metal dissolves in nitric acid to give blue coloured solution of copper nitrate and a reddish brown coloured gas of nitrogen dioxide.
Cu+4HNO3(conc.)Cu(NO3)2+2H2O+2NO2

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