Which of the following has least freezing point?

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1% sucrose

1% NaCl

1% CaCl2

1% glucose

answer is C.

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Detailed Solution

Depression in freezing point is a colligative property (i.e. depends only upon the number of particles of solutes). Thus, the compound which produces maximum number ofions will have the least freezing point.∴Concentration is same Sucrose →No ions NaCl →Na+ +Cl-⏟ Two ions CaCl2→ Ca2+2Cl-⏟ Three ions Glucose → No ions Thus, 1% CaCl2 will have the least freezing point.

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