1.

A red solid is insoluble in water.However it becomes soluble if some KI is added to water.Heating the red solid in a test tube results in 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 :`Hgl_(2) darr + 2l^(-) to [Hgl_(4)]^(2-)` (colourless SOLUBLE COMPLEX)
`Hgl_(2) overset(DELTA)to Hg+l_(2) uarr` (violet colour)


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