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Q.

The yellow colour solution of ${Na}_{2} {CrO}_{4}$ changes to orange red on passing ${CO}_{2}$ gas due to the formation of:

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a

${CrO}_{5}$

b

${CrO}_{3}$

c

${Cr}_{2} O_{3}$

d

${Na}_{2} {Cr}_{2} O_{7}$

answer is C.

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Detailed Solution

${CrO}_{4}^{2 -} \underset{H_{2} O}{\overset{{CO}_{2}}{\to}} {Cr}_{2} O_{7}^{2 -}$

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