A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating red solid in a test tube produces violet coloured fumes and droplets of metal appear on the cooler parts of test tube. The red solid is
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Hyyy
Red solid is. HgI2
》HgI2 is a scarlet red compound which is insoluble in water.
Reaction is ==>
HgI2+2KI. ------> K2(HgI4) (soluble)
On heating
HgI2 -------> Hg+ I2 (violet vapour droplet)
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