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When SO2 is passed through solution of potassium dichromate, then chromium sulphate in formed.

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When SO2 is passed through solution of potassium dichromate, then chromium sulphate in formed. Change in valency of chromium is

(a) +4 to +2

(b) +5 to +3

(c) +6 to +3

(d) +7 to +2

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Correct option is (c) +6 to +3

Ox. No. of Cr in K2Cr2O7 is +6 and that in chromic sulphate Cr2 (SO4)3, it is +3.

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