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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 Kl 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 test tube. The red solid is

A

(HgI)_(2)

B

(Hg) (O)

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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