NEET 2019 Odisha · ChemistryPrevious Year Question

The density of a 2 M aqueous solution of $NaOH$ is 1.28 g cm $^{- 3}$ . The molality of the solution is (molar mass of $NaOH$ = 40 g mol $^{- 1}$ )

Answer: (C) 1.67 m. \textbf{Answer:} (C) 1.67 m \textbf{Solution:} Take 1 L (1000 cm $^{3}$ ) of solution containing 2 mol $NaOH$ .

A.1.20 m
B.1.56 m
C.1.67 m✓
D.1.32 m

Correct Answer

Solution & Explanation

\textbf{Answer:} (C) 1.67 m \textbf{Solution:} Take 1 L (1000 cm $^{3}$ ) of solution containing 2 mol $NaOH$ . Mass of solution $= 1000 \times 1.28 = 1280$ g; mass of solute $= 2 \times 40 = 80$ g. Mass of solvent $= 1280 - 80 = 1200$ g $= 1.2$ kg. Molality $= \frac{2}{1.2} = 1.67$ m.

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The density of a 2 M aqueous solution of NaOH is 1.28 g cm−3. The molality of the solution is (molar mass of NaOH = 40 g mol−1)

Solution & Explanation

More NEET PYQ solutions

The density of a 2 M aqueous solution of $NaOH$ is 1.28 g cm $^{- 3}$ . The molality of the solution is (molar mass of $NaOH$ = 40 g mol $^{- 1}$ )