A red solid is insoluble in water. However, it becomes soluble if some K I 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

Question

A red solid is insoluble in water. However, it becomes soluble if some K I 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, H g I 2, H g O, P b 3 O 4, N H 4 2 C r 2 O 7

MARKS App · Accepted Answer

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

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