In the reaction represented by the equation; 2FeCI3 + SO2 + 2H2O → 2FeCL2 + H2SO4 + 2HCI the oxidation number of sulphur changes from

A. +2 to + 6
B. + 4 to + 6
C. 0 to + 6
D. – 2 to + 4
E. +2 to + 4

Correct Answer: Option B

B. + 4 to + 6