Question

$P{H}_3$ produces smoky rings when it comes in contact with air. This is because:

• A. It is inflammable
• B. It combines with water vapour
• C. It combines with nitrogen
• D. It contains impurity of $P_2{H}_4$

Answer 1

The correct option is D It contains impurity of $P_2{H}_4$

Phosphine contains spontaneously inflammable $P_2{H}_4$ as an impurity due to which it produces smoky ring when it comes in contact with air.