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Q.

Alkaline solution of potassium chromate reacts with 30%H2O2 to produce a red brown paramagnetic species K3CrO8 The oxidation state of chromium in this compound is (X) and number of oxygen atoms directly bounded to chromium are (Y) then (Y-X) is______ 

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answer is 3.

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Detailed Solution

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Since all the oxygens present are peroxide bonded, the
oxidation state of Cr is, (X) = 5.

number of oxygen atoms directly bounded to chromium(Y)=8

X is 5, Y is 8

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