JEE Main Chemistry question

ChemistryThe p-Block ElementsJEE Main

When phosphine gas is passed into a solution of silver nitrate, a black precipitate is formed, together with the evolution of

Answer: (A)

Solution

Phosphine reduces silver nitrate, itself being oxidised, to deposit black elemental silver (sometimes described via the intermediate silver phosphide, ), liberating nitric acid:

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Question ID VK-146311