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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. Heating rod solid in a test tube produces violet coloured fumes and droplets of metal appear on the cooler parts of test tube. The red solid is

A

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

B

`HgI_(2)`

C

HgO

D

`Pb_(3)O_(4)`

Text Solution

Verified by Experts

`HgI_(2)` is scarlet red compound insoluble in water `HgI_(2)+2KI to underset("(soluble)")(K_(2)(HgI_(4))) HgI_(2) overset("Heat")to underset("Droplet")(Hg)+underset("(Violet vapour)")(I_(2))`
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