A red solid is insoluble in water. Howev...

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 rod solid is:

`(NH_(4))_(2) Cr_(2)O_(7)`

`HgI_(2)`

`HgO`

`Pb_(3)O_(4)`

Text Solution

Verified by Experts

The correct Answer is:

`HgI_(2)` is water insoluble.
`HgI_(2) overset(KI)rarr underset(("Soluble"))(K_(2)HgI_(4))overset(Delta)rarr underset(("Violet fumes"))(Hg+I_(2))`

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