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Which one of the following pairs is an example of polar molecular solids ?

1. SO 2 (s), CO 2 (s)
2. SO 2 (s), NH 3 (s)
3. MgO(s), SO 2 (s)
4. HCl(s), AIN(s)

Correct answer: SO 2 (s), NH 3 (s)

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