Practice question
Question
The freezing point depression of a 0.1 m aqueous NaCl solution is 0.347 K. What is the van't Hoff factor? ( K_f = 1.86 K kg/mol )
Explanation
Given:
The freezing point depression of a 0.1 m aqueous NaCl solution is 0.347 K. What is the van't Hoff factor? ( K_f = 1.86 K kg/mol )
Formula:
Δ T_f = i · K_f · m.
Substitution & Calculation:
0.347 = i × 1.86 × 0.1 . i = 0.347/1.86 × 0.1 = 0.347/0.186 = 1.87 .
Final Result:
The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.
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