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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn161

Which of the following statements about sulphur dioxide is/are correct?

  1. AThe molecule is bent, with sp2 hybridised sulphur.
  2. BIt can act as both an oxidising agent and a reducing agent.
  3. CIts bleaching action is permanent because it oxidises the dye.
  4. DIt dissolves in water to give sulphurous acid, .

Answer: A, B, D

SO2 has two bond pairs and one lone pair (bent, sp2). S is in the +4 state, between -2 and +6, so SO2 can be oxidised or reduced. It forms H2SO3 with water. Bleaching by SO2 is by reduction and is temporary, so the last statement is false.
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