Question

why chloridis of silver , lead and mercury insoluble

Answer 1

The yellow precipitate is that form of the iodide which is best adapted for photographic purposes. It is insoluble in water and in dilute nitric acid; almost insoluble in ammonia; and is not so soon colored by the action of light as the chloride.

It is insoluble because the energy holding the atoms together is greater than the attraction of water molecules for the silver atoms. As a result, the silver atoms are more attracted to each other than to the water molecules.


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