Question

Which of the following solids is not an electrical conductor ?

(I) $Mg_{(s)}$ (II) $TiO_{(s)}$ (III) $I_{2(s)}$ (IV) $H_{2}O_{(s)}$

• A. (I) only
• B. (II) only
• C. (III) and (IV)
• D. (II),(III) and (IV)

Answer 1

Answer: (C)

(III) and (IV)

Answer 2

$I_{2(s)}$is a non – polar molecular solid and is an insulator. $H_{2}O_{(s)}$is a hydrogen bonded molecular solid and is an insulator.

Mg is metallic solid and is a conductor in solid as well as in molten state. TiO is an ionic solid and is an insulator in solid state but is a conductor in molten state and in aqueous solutions.