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Question

Cr2O27pH=xCrO24pH=yCr2O27
pH values x and y can be:

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

The correct option is D 8 and 4
In alkaline medium, the dichromate ion is converted to the chromate ion.
In acidic medium, the dichromate ion is converted to the chromate ion.
Cr2O27pH=x=8>7CrO24pH=y=4<7Cr2O27
Hence, pH values x and y can be 8 and 4.

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