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Question

Cr2O27pH=x−−CrO24pH=y−−Cr2O27

pH value x and y can be:

A
4 and 5
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B
4 and 8
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C
8 and 3
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D
8 and 9
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Solution

The correct option is C 8 and 3
Cr2O27+2OH2CrO24+2H2O
pH>7 (x>7)
2CrO24+2H+Cr2O27+H2O
pH<7 (y<7)

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