A red-colored solid does not dissolve in water, but it dissolves when a little KI is added to the water. On heating this red solid in a test tube, violet vapours are evolved and tiny droplets of a metal deposit on the cooler part of the tube. The red solid is

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HgI2. The red solid is HgI2 (mercury(II) iodide), which is known to be insoluble in water but dissolves in potassium iodide (KI) due to the formation of a complex ion. Upon heating, HgI2 decomposes, releasing violet iodine vapors and leaving behind metallic mercury as droplets.

A red-colored solid does not dissolve in water, but it dissolves when a little KI is added to the water. On heating this red solid in a test tube, violet vapours are evolved and tiny droplets of a metal deposit on the cooler part of the tube. The red solid is

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