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JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties

3 M NaCl विलयन का घनत्व \(1.25 \mathrm{~g} / \mathrm{mL}\) है। विलयन की मोललता _______ है।

  1. A 1.79 m
  2. B 2.79 m
  3. C 2 m
  4. D 3 m
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Answer & Solution

Correct Answer

(B) 2.79 m

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Detailed explanation

\begin{aligned} & 3 \mathrm{M} \mathrm{NaCl}, \mathrm{d}_{\text {sol }}=1.25 \mathrm{gm} / \mathrm{mol} \\ & \begin{aligned} \text { Molality } & =\frac{\mathrm{M} \times 1000}{1000 \mathrm{~d}-\mathrm{M} \times \mathrm{M}_{\mathrm{W}}} \\ &…

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