Redox Reactions

From the given list, the number of compounds with +4 oxidation state of Sulphur . SO3, H2SO3, SOCl2, SF4, BaSO4, H2S2O7

Answer

3

Solution

Sum of oxidation numbers = 0 (O = −2, H = +1, Cl = F = −1, Ba = +2):

SO3: x − 6 = 0 ⇒ +6

H2SO3: 2 + x − 6 = 0 ⇒ +4 ✓

SOCl2: x − 2 − 2 = 0 ⇒ +4 ✓

SF4: x − 4 = 0 ⇒ +4 ✓

BaSO4: 2 + x − 8 = 0 ⇒ +6

H2S2O7: 2 + 2x − 14 = 0 ⇒ +6

∴ +4 state in 3 compounds

Answer: 3