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At pH=4,CrO(4)^(2-) exists as...

At `pH=4,CrO_(4)^(2-)` exists as

A

`CrO_(4)^(2-)`

B

`CrO_(3)`

C

`CrO_(2)^(2-)`

D

`Cr_(2)O_(7)^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
D
PH=4 means acidic medium
`2CrO_(4)^(2-)+2H^(+)rarrCr_(2)O_(7)^(2-)+H_(2)O (CrO_(4)^(2-)underset(pHgt7)overset(pHlt7)hArrCr_(2)O_(7)^(2-))`
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