JEE Main · 2021 · 31 Aug 2021 · Shift 1 · Solutions

Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression?

(A)glucose
(B)hydrazine
(C)glycine
(D) $KHSO_{4}$ ✓ Correct

Answer: (D)

Solution

Freezing-point depression depends on the number of dissolved particles, that is on the van't Hoff factor

i

. Glucose, hydrazine and glycine remain essentially single neutral particles in water, each with

i \approx 1

. Potassium hydrogen sulphate dissociates into

K^{+}

and

HS O_{4}^{-}

, giving

i \approx 2

and the greatest particle count. The largest freezing-point depression is shown by the

KHS O_{4}

solution.

JEE Main · 2021 · 31 Aug 2021 · Shift 1 · Single correct option

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