Question

In which of the following acids oxidation state of sulphur is different from that of the others ?

• A. Caro?? acid
• B. Marshall?? acid
• C. Sulphuric acid
• D. Sulphurous acid

Answer 1

Answer: (D)

Sulphurous acid

Answer 2

In sulphurous acid ${(H_2SO_3)}$, the O.N. of S is $2 \times (+ 1) + x + 3 \times (\sim \, 2) = 0$ or x = + 6-2 = + 4 .In other adds, the O.N. of S is + 6.