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Question

In the following reaction : Cr(OH)3+OH+IO3CrO24+H2O+I:

A
IO3 is oxidising agent
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B
Cr(OH)3 is oxidised
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C
6e are being taken per iodine atom
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D
all of these
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Solution

The correct option is D all of these
Balanced chemical equation is,
2Cr(OH)3+IO3+4OH2CrO24+I+5H2O
I5++6eI(Reduction)
Oxidation state of Cr is changing from +3 to +6,
2Cr3+2Cr6++6e(Oxidation)
Hence Cr(OH)3 is oxidized and this implies IO3 is oxidizing agent.

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