A filter paper soaked in salt X turns brown w | vedclass

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(C) . When a filter paper soaked in salt $X$ is exposed to $HNO_{3}$ vapor,it turns brown due to the liberation of iodine gas $(I_{2})$,which is brown

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$KI$

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(C) . When a filter paper soaked in salt $X$ is exposed to $HNO_{3}$ vapor,it turns brown due to the liberation of iodine gas $(I_{2})$,which is brown in color. This reaction occurs because $KI$ acts as a strong reducing agent and reduces $HNO_{3}$ to $NO_{2}$ (a brown gas) while $I^{-}$ is oxidized to $I_{2}$. The chemical reaction is: $2KI + 4HNO_{3} \longrightarrow I_{2} + 2NO_{2} + 2KNO_{3} + 2H_{2}O$.

$A$ filter paper soaked in salt $X$ turns brown when exposed to $HNO_{3}$ vapor. The salt $X$ is

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