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 _______________.

(N H_{4})_{2} C r_{2} O_{7}

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H g I_{2}

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H g O

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P b_{3} O_{4}

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Solution

The correct option is B $H g I_{2}$
If a salt gives metal on heating then there is a chance that salt is the composition of any of these e.g Pb, Hg, Au, Ag etc.
Here after heating violet coloured fumes observed that confirms Iodine gas.
so, the answer is $H g I_{2}$
Reaction:
$H g I_{2} + 2 K I \to K_{2} H g I_{4}$
$H g I_{2} \to H g + I_{2}$ (violet)

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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 _______________.

The correct option is B HgI2If a salt gives metal on heating then there is a chance that salt is the composition of any of these e.g Pb, Hg, Au, Ag etc.Here after heating violet coloured fumes observed that confirms Iodine gas.so, the answer is HgI2Reaction:HgI2+2KI→K2HgI4HgI2→Hg+I2(violet)