In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M `MgCl_(2)` solution is …….

Options

A. the same
B. about twice
C. about three times
D. about six times

Answer

C

Explanation

Explanation : Depression in freezing point is a colligative property. In case of `MgCl_(2)` value of van.t. Hoff factor will be more.
No. of ions yielded when a molecule of `MgCl_(2)` gets dissociated in its aqueous solution is = 3. Thus one molecule of 0.01 M `MgCl_(2)` given out three particles / ions in solution, thereby increasing the number of particles present in its solution to three times.
It is because of this that depression in freezing point of 0.01 M `MgCl_(2)` will be three times as compared to that of 0.01 M - glucose solution, where no dissociation of the molecule takes place.