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PCl5 reacts with finely divided silver on heating

Question:

PCl5 reacts with finely divided silver on heating and a white silver salt is obtained, which dissolves on adding excess aqueous NH3 solution. Write the reactions involved to explain what happens.

Solution:

PCl5 reacts with silver to form white silver salt(AgCl). Which than dissolves on adding excess aqueous NH3 to form a soluble complex

PCl5 + 2Ag 2AgCl(white ppt.) + PCl3

AgCl + 2NH3(aq) [Ag(NH3)]+Cl-

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