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A brown gas which itensifies on adding c...

A brown gas which itensifies on adding cu-turnings in conc.`H_(2)SO_(4)` test is` NO_(2)`
Copper reacts with conc.`HNO_(3)` to give `NO_(2)`

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The correct Answer is:
A
On adding cu turning brown colour intensified because it also convert `HNO_(3)` into `NO_(2)`.
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