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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. On heating the red solid in a test tube, there is 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

`HgO`

B

`Pb_(3)O_(4)`

C

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

D

`Hgl_(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
The red solide is `Hgl_(2)`
`underset(("Red solide"))(Hgl_(2)) + 2 Kl rarr underset(("soluble"))(K_(2) [Hgl_(4)])`
`Hgl_(2) overset("heat")rarr underset(("Droplets"))(Hg(l)) + underset(("Violet fumes"))(I_(2)(g))`
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