MHT CET Medical202623 April 2026Evening ShiftChemistryRedox ReactionsActual
What is the change in oxidation number of S in the following reaction? SO ₂ + 2 H ₂ S 3 S + 2 H ₂ O
Options
- A-2 to 1
- B-2 to 0
- C-2 to 3
- D-2 to -3
Correct answer
B. -2 to 0
Step-by-step solution
In H₂S , let the oxidation number of S be x . Assuming the typical oxidation number of H is +1 : 2(+1) + x = 0 x = -2 In the products, sulfur is formed in its standard elemental state as S. The oxidation number of any element in its free uncombined state is 0 . Thus, the oxidation number of S changes from -2 to 0 . Answer: -2 to 0