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When conc. `H_2 SO_4` is added to dry `KNO_3` brown fumes evolve. These fumes are of

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When conc. `H_2 SO_4` is added to dry `KNO_3` brown fumes evolve. These fumes are of
A. `SO_(2)`
B. `SO_(3)`
C. `NO`
D. `NO_(2)`
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`2KNO_(3) +2H_(2)SO_(4) to 2KHSO_(4) + underset("Brown fumes")(4NO_(2)uarr)+2H_(2)O + O_(2)`
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