D And F Block Elements Question 320
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 $
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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.
BETA
