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Classification of Alcohols

When CO2 is...

Question

When $C O_{2}$ is passes into aqueous $K_{2} C r O_{4}$ solution, this changes to another colour. What is the another colour?

Black

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Yellow

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Pink

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Orange

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Solution

The correct option is D Orange
$C O_{2} + H_{2} O ⇌ H_{2} C O_{3}$ ,
$H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{-}$ ,
$H^{+}$ change $K_{2} C R O_{4}$ into $K_{2} C r_{2} O_{7}$ ,
$2 C r O_{4}^{2 -} y e l l o w + 2 H^{+} ⟶ C r_{2} O_{7}^{2 -} o r a n g e + H_{2} O$

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