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 :`UNDERSET("Red solid")(HgI_(2)+)2KItoK_(2)(HgI_(4))` soluble
`HgI_(2)toHg+I_(2)` violet fumes.


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