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Question

The addition of concentrated HNO3 to unknown metal produced an brown gas. Identity the gas?

A
Cl2
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B
H2
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C
O2
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D
CO2
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E
NO2
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Solution

The correct option is E NO2
Suppose a metal Copper reacts with conc. HNO3 the reaction will be written as-
Cu+4HNO3Cu(NO3)2+2NO2+2H2O
So, the orange or brown colored gas which is formed is Nitrogen dioxide or NO2
Option E is the correct answer.

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