Chromate and dichromate ions respectivel...

Chromate and dichromate ions respectively are

A

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

B

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

C

`Cr_(2)O_(4)^(2-) and Cr_(2)O_(5)^(2-)`

D

`Cr_(2)O_(5)^(2-) and CrO_(4)^(2-)`

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