A) freezing point is raised
B) freezing point is lowered
C) freezing point does not change
D) boiling point is raised
Correct Answer: A
Solution :
Depression in freezing point is a colligative property ie, depends upon the number of particles. When mercuric iodide is added to aqueous solution of potassium iodide, a complex potassium tetraiodomercurate (II) is formed. \[Hg{{I}_{2}}+2KI\xrightarrow{{}}{{K}_{2}}[Hg{{I}_{4}}]\] Hence, number of particles decreases and freezing point increases.
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