Acidified solution of chromic acid on treatment with H2O2, gives blue colour which is due to
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answer is 3.
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Detailed Solution
K2Cr2O7+H2SO4+4H2O2⟶2CrO5+K2SO4+5H2OChromic peroxideThe blue colour due to chromic peroxide fades away gradually due to decomposition ofCrO5 to Cr3+ ions and oxygen.