If $C O_{2}$ (g) under pressure is passed into $N a_{2} C r O_{4}$ (aq), yellow colour solution changes to another coloured solution. What is it ?

Pink

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Green

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Brown

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Orange

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Solution

The correct option is D Orange
$C O_{2} + H_{2} O ⇌ H_{2} C O_{3} ⇌ H^{+} H C O_{3}^{-}$ ,

$2 C r O_{4}^{2 -} y e l l o w + 2 H^{+} \to C r_{2} O_{7}^{2 -} o r a n g e + H_{2} O$ ,

Aqueous $C O_{2}$ is acidic and changes yellow $C r O_{4}^{2 -}$ into orange $C r_{2} O_{7}^{2 -}$

Option D is correct.

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