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What causes the colour change from CrO42- (yellow) to Cr2O72- (orange)? a. Oxidation b. Acid-base reaction c. Reduction d. Both an acid-base reaction and reduction

What causes the colour change from CrO42- (yellow) to Cr2O72- (orange)?

a. Oxidation

b. Acid-base reaction

c. Reduction

d. Both an acid-base reaction and reduction

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