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STANDARD Chemistry Colligative Properties MCQ Question

Type: MCQ-numerical-Medium-Class 12

What will be the freezing point of a 0.5 m KCl solution? The molal freezing point constant of water is 1.86°C m⁻¹.

A

−1.86°C

B

−0.372°C

C

−3.2°C

D

0°C

Correct Answer

Option A

Detailed Explanation

The freezing point depression is calculated using ΔTₓ = iKₘ × m. For KCl, i = 2. Thus, ΔTₓ = 2 × 1.86 × 0.5 = 1.86°C. The freezing point is 0 − 1.86 = −1.86°C.

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