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18/11/2021 10:44 am
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When SO2 is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in valency of chromium is
(a) +4 to +2
(b) +5 to +3
(c) +6 to +3
(d) +7 to +2
1 Answer
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18/11/2021 10:48 am
Correct answer: (c) +6 to +3
Explanation:
K2Cr2O7 + 3SO2 + 4H2SO4 → K2SO4 + Cr2(SO4)3 + 3SO3 + 4H2O
O.N. of chromium changes from +6 to +3