An equilibrium exists between Cr2O7-2 and CrO4-2 at pH=x ; At pH
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a
CrO4-2
b
Cr2O7-2
c
Both exist in equal proportions
d
None of them exist
answer is B.
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Detailed Solution
Cr2O7-2+2OH-⇌2CrO4-2+H2O; In basic medium dichromate ionorange converts to chromate ionyellow; 2CrO4-2+2H+⇌Cr2O7-2+H2O; In acidic medium chromate ionyellow converts to dichromate ionorange