NEET 2023 Phase 2 · ChemistryPrevious Year Question

The density of a 1 M solution of a compound 'X' is $1.25 g mL^{- 1}$ . The correct option for the molality of the solution is (Molar mass of compound X $= 85 g$ ):

Answer: (B) 0.858 m. \textbf{Answer:} (B) 0.858 m \textbf{Solution:} Consider 1 L (1000 mL) of the 1 M solution → it contains 1 mole of X.

A.1.165 m
B.0.858 m✓
C.0.705 m
D.1.208 m

Correct Answer

(B) 0.858 m

Solution & Explanation

\textbf{Answer:} (B) 0.858 m \textbf{Solution:} Consider 1 L (1000 mL) of the 1 M solution → it contains 1 mole of X. Mass of solution $= 1000 \times 1.25 = 1250$ g. Mass of solute $= 1 \times 85 = 85$ g. Mass of solvent $= 1250 - 85 = 1165$ g $= 1.165$ kg. Molality $= \frac{1}{1.165} = 0.858 m$ .

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The density of a 1 M solution of a compound 'X' is 1.25 g mL−1. The correct option for the molality of the solution is (Molar mass of compound X =85 g):

Solution & Explanation

More NEET PYQ solutions

The density of a 1 M solution of a compound 'X' is $1.25 g mL^{- 1}$ . The correct option for the molality of the solution is (Molar mass of compound X $= 85 g$ ):