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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

`HgI_2`

B

HgO

C

`Pb_3O_4`

D

`(NH_4)_2Cr_2O_7`

Text Solution

Verified by Experts

The correct Answer is:
A
`underset"(insoluble)"(HgI_2) + KI to underset"(soluble)"(K_2HgI_4)`
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