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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_(3)O_(4)`

D

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

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The correct Answer is:
A
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