MCQ
Molality (m) of $3 \mathrm{M}$ aqueous solution of $\mathrm{NaCl}$ is:
(Given : Density of solution $=1.25 \mathrm{~g} \mathrm{~mL}^{-1}$, Molar mass in $\left.\mathrm{g} \mathrm{mol}^{-1}: \mathrm{Na}-23, \mathrm{Cl}-35.5\right)$
- A$2.90 \mathrm{~m}$
- ✓$2.79 \mathrm{~m}$
- C$1.90 \mathrm{~m}$
- D$3.85 \mathrm{~m}$