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In the interconversion Cr2O7²- (orange) <-> 2 CrO4²- (yellow), reagent X drives the equilibrium to the right and reagent Y drives it back to the left. X and Y are respectively:

1. X = OH-, Y = H+
2. X = H+, Y = OH-
3. X = OH-, Y = H2O2
4. X = H2O2, Y = OH-

Correct answer: X = OH-, Y = H+

Solution

OH- shifts Cr2O7²- to CrO4²- (forward), while H+ shifts CrO4²- back to Cr2O7²- (backward).

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