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Question

$$PCl_5$$ reacts with finely divided silver on heating and a white silver salt is obtained, which dissolves on adding excess aqueous $$NH_3$$ solution. Write the reactions involved to explain what happens.

Solution
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$$PCl_{ 5 }+2Ag\rightarrow 2AgCl+PCl_{ 3 }$$

$$AgCl+2NH_{ 3 }(aq)\rightarrow [Ag(NH_{ 3 })_{ 2 }]^{ + }Cl^{ - }$$

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