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  4. 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 red solid is

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Q. 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 red solid is

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Solution:

$HgI_{2}$ is orange-red in appearance and hardly soluble in water. It dissolves in excess of $I^{-}$ giving complexes $HgI_{3}^{-}$ and $HgI_{4}^{2 -}$ . Violet fumes are liberated due to the release of Iodine gas upon heating.