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
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 :
A. `(NH_(4))_(2)Cr_(2)O_(7)`
B. `HgI_(2)`
C. `HgO`
D. `Pb_(3)O_(4)`
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Correct Answer - 2
`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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