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0.1 m aqueous solution of NaCl (assumed fully ionised) has a freezing-point depression closest to (K_f = 1.86 K kg/mol)
A0.186 K
B0.093 K
C0.372 K
D0.744 K
Answer & Solution
Correct answer: C. 0.372 K
1. For an electrolyte ΔT_f = i · K_f · m where i is the van't Hoff factor.
2. For fully dissociated NaCl, i = 2.
3. ΔT_f = 2 × 1.86 × 0.1 = 0.372 K.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 2 "Solutions" §2.8_
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