What is the red coloured solid compound that is insoluble in water which becomes soluble if some KI is added…

What is the red coloured solid compound that is insoluble in water which becomes soluble if some KI is added to water and also heating the 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?

  1. NH42Cr2O7
     
  2. HgI2
     
  3. HgO
  4. Pb3O4

Solution

HgI2
 

Asked in: JEE-TOPICTESTS-CHEMISTRY

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