$A$ 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 the liberation of violet-coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is:
- A$(NH_4)_2Cr_2O_7$
- B$HgI_2$
- C$HgO$
- D$Pb_3O_4$
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