`Cr_(2)O_(7)^(2-)overset(pH=x)rarrCrO_(4)^(2-)overset(pH=y)rarrCr_(2)O_(7)^(2-)` x and y can be :
`Cr_(2)O_(7)^(2-)overset(pH=x)rarrCrO_(4)^(2-)overset(pH=y)rarrCr_(2)O_(7)^(2-)`
x and y can be :
A. 4 and 5
B. 4 and 8
C. 8 and 4
D. 8 and 9
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Correct Answer - C
`Cr_(2)O_(7)^(2-)+2OH^(-)rarr2CrO_(4)^(2-)+H_(2)O" "pHgt7(xlt7)`
`2CrO_(4)^(2-)+2H^(+)rarrCr_(2)O_(7)^(2-)+H_(2)O" "pH lt7(Ylt7)`
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