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The incorrect statements among the following is

1. PH 3 shows lower proton affinity than NH 3 .
2. PF 5 exists but NF 5 does not.
3. NO 2 can dimerise easily.
4. SO 2 can act as an oxidizing agent, but not as a reducing agent.

Correct answer: SO 2 can act as an oxidizing agent, but not as a reducing agent.

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