(D) When concentrated $H_2SO_4$ reacts with dry $KNO_3$,it produces $KHSO_4$ and $HNO_3$. The $HNO_3$ produced decomposes upon heating to release brow

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(D) When concentrated $H_2SO_4$ reacts with dry $KNO_3$,it produces $KHSO_4$ and $HNO_3$. The $HNO_3$ produced decomposes upon heating to release brown fumes of nitrogen dioxide $(NO_2)$. The reaction is: $2KNO_3 + H_2SO_4 \to 2KHSO_4 + 2NO_2 \uparrow + \frac{1}{2}O_2 \uparrow$ (Brown gas).