Analytical Chemistry Question 157
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 coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is
[AIEEE 2003]
Options:
A) $ {{( NH_4 )}_2}Cr_2O_7 $
B) $ HgI_2 $
C) $ HgO $
D) $ Pb_3O_4 $
Show Answer
Answer:
Correct Answer: B
Solution:
$ \underset{\text{Red solid}}{\mathop{HgI_2+2K}}I\to K_2(HgI_4) $ soluble $ HgI_2\to Hg+I_2 $ violet foams.
BETA
