Question

Which one of the following forms vortex ring?

• A. $P_{2}O_{5}$
• B. $PH_{3}$
• C. $NH_3$
• D. $P_{4}O_{10}$

Answer 1

Answer: (B)

$PH_{3}$

Answer 2

Phosphine when comes in contact with air, it forms vortex rings of $P _{2} O _{5}$ in the form of white smoke so it is used to prepare smoke screens in warfare. $2 PH _{3}+4 O _{2} \longrightarrow P _{2} O _{5}+3 H _{2} O$