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STD 12 -1. Solution and colligative properties — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 -1. Solution and colligative properties4 Marks
MCQ
The mole fraction of the solute in one molal aqueous solution is
  • A
    $0.027$
  • B
    $0.036$
  • ✓
    $0.018$
  • D
    $0.009$
✓

Answer

Correct option: C.
$0.018$
c
(c) $W = 1000\,gm$ $({H_2}O)$; $n = 1\,mole$

$N = \frac{W}{M} = \frac{{1000}}{{18}} = 55.55$

${x_{{\rm{Solute}}}}\,=\,\frac{n}{{n + N}} = \frac{1}{{1 + 55.55}}$ $= 0.018.$

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