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

Iodine crystals can be classified as .......

$PBr_{5(s)} \rightarrow PBr_{4}^{+} + Br^{-}$
$Br^{-} + Br_2 \rightarrow Br_{3}^{-}$
Which of the following forces is responsible for the interaction of $X^{-}$ and $X_2$ to form a coordinate bond between $X^{-}$ and $X_2$?

Solid $PCl_5$ exists as

Electricity does not pass through ionic compounds in which of the following states?

Which of the following does not apply to metallic bond?