A) \[{{P}_{2}}{{O}_{5}}\]
B) \[P{{H}_{3}}\]
C) \[\text{N}{{\text{H}}_{\text{3}}}\]
D) \[{{P}_{4}}{{O}_{10}}\]
Correct Answer: B
Solution :
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. \[\text{2P}{{\text{H}}_{\text{3}}}+\text{4}{{\text{O}}_{\text{2}}}\xrightarrow{{}}\text{ }{{\text{P}}_{\text{2}}}{{\text{O}}_{\text{5}}}+\text{3}{{\text{H}}_{\text{2}}}O\]
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