D-And F-Block Elements Ques 447

Question: 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 colored fumes and droplets of metal appear on the cooler part of the test tube. The red solid is

Options:

A) $ HgO $

B) $ Pb_3O_4 $

C) $ {{(NH_4)}_2}Cr_2O_7 $

D) $ HgI_2 $

Show Answer

Answer:

Correct Answer: D

Solution:

$ HgI_2+2KI\to K_2HgI_4 $ Also $ HgI_2\xrightarrow{\Delta }Hg+I_2\uparrow (violet) $

Hg being volatile metal deposits at cooler part of test tube.



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