Question

Which of the following solids is not an electrical conductor?
(I) $M{g}_{\left(s\right)}$
(II) $Ti{O}_{\left(s\right)}$
(III) $I_{2\left(s\right)}$
(IV) $H_2{O}_{\left(s\right)}$

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

Answer 1

The correct option is C (III) and (IV)

$I_{2\left(s\right)}$ is a non-polar molecular solid and is an insulator. $H_2{O}_{\left(g\right)}$ 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.

Hence, Option "C" is the correct answer.