When CuSO4 is added to solution of ammonia then why freezing point is raised

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Solution

Copper sulphate in ammonia solution form a complex which will lead to decrease the number of particles in solution. So, van`t hoff factor will decrease. Depression in freezing point and elevation in boiling point are directly proportional to the van`t hoff factor. Decreases in number of particles causes the increase in freezing point and decrease in the boiling point.

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