Ncert Exercises & Solutions

I. Mg(s)

II. TiO(s)

III. I₂(s)

IV. H₂O(s)

The insulator among the given examples is -

1. Only I

2. Only II

3. III and IV

4. II, III, and IV

HINT: Molecular solids are insulators.

Explanation:

Iodine is a non-polar molecular solid in which iodine molecules are held together by London force or dispersion force. This is a soft and non-conductor of electricity.

Water is a hydrogen-bonded molecular solid in which H and O are held together by polar covalent bonds and each water molecule is held together by hydrogen bonding. Due to non-ionic nature, they are not an electrical conductor.

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