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Question

Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of:

A
CrO24
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B
Cr2(SO3)3
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C
CrSO4
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D
Cr2(SO4)3
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Solution

The correct option is C Cr2(SO4)3
Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of
Cr2(SO4)3

K2Cr2O7+3Na2SO3+4H2SO4Cr2(SO4)3+K2SO4+3Na2SO4+4H2O
Hence option D is correct.

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