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Question

What changes occur when acidified Cr2O27 ion reacts with H2O2 solution in presence of ether solvent?

A
Orange colour of solution turns blue
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B
Oxidation state of Cr atom increases
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C
Oxidation state of Cr atom remains constant
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D
Orange colour turns green
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Solution

The correct option is A Orange colour of solution turns blue
When H2O2 is added to the acidified potassium dichromate solution (orange colour), the deep blue CrO5 is obtained.
K2Cr2O7+H2SO4+4H2O22CrO5+K2SO4+5H2O
The deep blue colour fades away due to the formation of chromic sulphate. Oxygen is evolved in this process.
4CrO5+6H2SO42Cr2(SO4)3+6H2O+7O2

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