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Q.

K2Cr2O7 cannot be used for

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a

preparing azo compounds

b

tanning leather

c

as a laboratory oxidant

d

as a reductant

answer is D.

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Detailed Solution

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The maximum oxidation state of Cr is +6, Hence K2Cr2O7 can not be furtherly oxidized and cannot be used as a reductant.

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K2Cr2O7 cannot be used for