Question

0.1 M solution of which of the following compounds will have the lowest freezing point?

• A. $FeSO _{4} \cdot\left( NH _{4}\right)_{2} SO _{4} \cdot 6 H _{2} O$
• B. $\left[\right.CrCl_{2}\left(\right.NH_{3}\left.\right)\left]\right.Cl$
• C. $K _{3}\left[ Fe ( CN )_{6}\right]$
• D. $\left[ Co ( Cl )\left( NH _{3}\right)_{5}\right] Cl _{2}$

Answer 1

Answer: (A)

$FeSO _{4} \cdot\left( NH _{4}\right)_{2} SO _{4} \cdot 6 H _{2} O$ (Mohr's Salt) is an example of double salt and have maximum number of ions in the solution, so it will have least freezing point.