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Question
Give two reactions in which acidified K2Cr2O7 is used as an oxidizing agent.
Answer in Brief
Solution
Oxidation of I− of Kl to I2:
K2Cr2O7 + 6KI + 7H2SO4 → 4K2SO4 + Cr2(SO4)3 + 7H2O + 3I2
Oxidation of H2S to S:
K2Cr2O7 + 4H2SO4 + 3H2S → K2SO4 + Cr2(SO4)3 + 7H2O + 3S
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Chemical Properties of Elements of Groups 16, 17 and 18
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