pH=XCr2O2−7⇌CrO2−4(orange)pH=Y(green) This change is based on change in pH. Probable values of X and Y cannot be :
A
8, 6
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B
8, 10
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C
4, 6
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D
change is independent of pH
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Solution
The correct options are B 8, 10 C 4, 6 pH=X=8or4(lessthanY)Cr2O2−7⇌CrO2−4orangepH=Y=10or6(morethanX)green
As dichromate ion changes to chromate in acidic medium( less pH) , whereas chromate changes to dichromate in basic medium ( higher pH) Lower pH (acidic medium) → Cr2O2−7<========================>CrO2−4 ← Higher pH ( basic medium)