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  4. Which of the following aqueous solution has minimum freezing point?

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Q. Which of the following aqueous solution has minimum freezing point?

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Solution:

As we know,
$\Delta Tf = K _{ f } \cdot m \cdot i$
$T _{ f } \propto i$
more are ions, more will be $\Delta T _{ f }$ and
more is $\Delta T _{ f }$, lesser is freezing point.
The minimum freezing point means more is the number of ions
a. $0.01 \times 2=0.02$
b. $0.005 \times 1=0.005$
c. $0.005 \times 3=0.015$
d. $0.005 \times 2=0.01$