A red solide is insoluble in water. However it becomes soluble if some KI is added to water. On heating the red solid in a test tube, there is liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is :A. `HgO`B. `Pb_(3)O_(4)`C. `(NH_(4))_(2) Cr_(2)O_(7)`D. `Hgl_(2)`

A red solide is insoluble in water. However it becomes soluble if some

1.	A red solide is insoluble in water. However it becomes soluble if some KI is added to water. On heating the red solid in a test tube, there is liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is :A. `HgO`B. `Pb_(3)O_(4)`C. `(NH_(4))_(2) Cr_(2)O_(7)`D. `Hgl_(2)`
Answer» Correct Answer - D The red solide is `Hgl_(2)` `underset(("Red solide"))(Hgl_(2)) + 2 Kl rarr underset(("soluble"))(K_(2) [Hgl_(4)])` `Hgl_(2) overset("heat")rarr underset(("Droplets"))(Hg(l)) + underset(("Violet fumes"))(I_(2)(g))`

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