A) \[{{P}_{2}}{{O}_{5}}\]
B) \[N{{H}_{3}}\]
C) \[P{{H}_{3}}\]
D) \[{{P}_{4}}{{O}_{10}}\]
Correct Answer: C
Solution :
Phosphine when comes in contact with air, forms vortex ring of \[{{P}_{2}}{{O}_{5}}\]in the form of white smoke. Hence it is used to prepare smoke screens in warfare.
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