1.

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

Answer»

`CrO_(4)^(2-)`
`CrO_(3)`
`CrO_(2)^(2-)`
`Cr_(2)O_(7)^(2-)`

Solution :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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