Which of the following solutions has minimum freezing point?

0.01 M NaCl

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0.005 M C_{2} H_{5} O H

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0.005 M M g I_{2}

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0.005 M M g S O_{4}

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Solution

The correct option is A 0.01 M NaCl
Minimum freezing point means more number of ions
$(a) 0.01 \times 2 = 0.02 (b) 0.005 \times 1 = 0.005 (c) 0.005 \times 3 = 0.015 (d) 0.005 \times 2 = 0.01$

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