A) The mixture only cools down
B) \[PC{{l}_{3}}\] and HCl are formed and the mixture warms up
C) \[PC{{l}_{5}}\] and HCl are formed and the mixture cools down
D) \[P{{H}_{3}}.\,C{{l}_{2}}\] is formed with warming up
Correct Answer: C
Solution :
\[P{{H}_{3}}+4C{{l}_{2}}\to PC{{l}_{5}}+3HCl\]
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