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Vant Hoff's Equation and Effect of Temperature on Equilibrium Constant

A mixture con...

Question

A mixture contains ${N O}_{2}^{-}$ and ${S O}_{3}^{2 -}$ . On adding dilute $H_{2} {S O}_{4}$ and $K I$ and then starch, blue colour appears. This is due to :

{N O}_{2}^{-}

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{S O}_{3}^{2 -}

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both A and B

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None of the above

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Solution

The correct option is B ${N O}_{2}^{-}$
Nitrite reacts with sulphuric acid to form brown coloured nitrogen dioxide gas which turns paper saturated with starch and $K I$ , blue.
$2 K I + 2 N O_{2} \to 2 K N O_{2} + I_{2}$

$I_{2} + s t a r c h \to s t a r c h i o d i d e (b l u e)$

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