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Why does the colour of a solution change from yellow chromate ( [CrO 4 ] 2− ) ...
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Why does the colour of a solution change from yellow chromate ( [CrO4]2−) to orange dichromate
( [Cr2O7]2−) when acid is added?
2[CrO4]2-(aq) + 2H+ (aq) ⇌ [Cr2O7]2- (aq) +H2O (aq)
a. The equilibrium shifts from chromate to dichromate.
b. The colour change is due to an increase in the concentration of dichromate ions.
c. It is caused by a change in the oxidation state of chromium (redox reaction).
d. Both (a) and (b)
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