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Q.

Cr2O7−2orange⇌PH=xCrO4−2(yellow) . Equilibrium is attained at a pH=x then the incorrect statement regarding the process is

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a

pH >x, yellow colour dominates

b

pH < x,  orange colour dominates

c

pH = x, colour of the reaction mixture is intermediate of orange and yellow

d

pH has no influence on equilibrium state

answer is D.

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Detailed Solution

pH = x, dynamic equilibrium existsIn acidic medium,CrO4−2  changes to Cr2O7−2In basic medium, Cr2O7−2 changes to CrO4−2∴ pH > x...........basic medium – yellow CrO4−2  but not orange Cr2O7−2
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