1.

A red coloured solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating red solid in a test tube results in the liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is

Answer»

`(NH_(4))_(2)Cr_(2)O_(7)`
`HgI_(2)`
HgO
`Pb_(3)O_(4)`

Solution :The RED coloured solid in `Hgl_(2)`
`Hgl_(2)+2Kl to underset("Soluble")(K_(2)Hgl_(4))`
`Hgl_(2) overset("heat")toH_(g)+underset("Violet fumes")(I_(2))`


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