Statement - I : ${SO}_{2}$ reduces orange coloured $K_{2} {Cr}_{2} O_{7}$ to green coloured ${Cr}_{2} {({SO}_{4})}_{3}$ in presence of $H_{2} {SO}_{4}$
Statement - II : ${Na}_{2} {Cr}_{2} O_{7}$ is the primary standard in volumetric analysis

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Statement I and Statement II are true.

Statement I is true and statement II is false.

Statement I and Statement II are false.

Statement I is false and Statement II is true.

answer is B.

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Detailed Solution

I) $\begin{array}{l} {SO}_{2} + {Cr}_{2} O_{7}^{- 2} \overset{H^{+}}{\to} {Cr}^{+ 3} + {SO}_{4}^{- 2} \end{array}$

II) $K_{2} {Cr}_{2} O_{7}$ ….Primary standard in volumetric analysis

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