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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 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:

A

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

B

`HgI_(2)`

C

HgO

D

`Pb_(3)O_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset("Red solid")(HgI_(2)) + 2KI to K_(2) (HgI_(4))` soluble
`HgI_(2) to Hg + I_(2)` violet fumes.
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