COMEDK 2025 Morning Shift | Liquid Solution Question 2 | Chemistry

When $9.2 \times 10^{-3} \mathrm{~kg}$ of formic acid is added to 600 ml of water the freezing point of water is depressed. If $30 \%$ of Formic acid undergoes dissociation what would be the freezing point of the solution? ( $\mathrm{K}_{\mathrm{f}}$ of $\mathrm{H}_2 \mathrm{O}$ is 1.86 K kg mol ; MM of formic acid: 46 amu )

273.9 K

272.2 K

270.1 K

270.8 K

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

A non-volatile solute A weighing 60 g when dissolved in 212 g of the solvent Xylene reduces its vapour pressure to $60 \%$. What is the Molar mass of A in $\mathrm{g} / \mathrm{mol}$ ? [MM of xylene $=106 \mathrm{~g} / \mathrm{mol}$ ]

126

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

For a 1.0 molal solution containing the non-volatile solute Urea, the elevation in boiling point is 2.0 K while the depression in freezing point in a 3.0 molal solution having the same solvent is $4.0 K$. If the ratio $\frac{K_b}{K_f}=\frac{1}{X}$, what is the value of $X$ ?

$\frac{1}{2}$

$\frac{1}{4}$

$\frac{2}{3}$

$\frac{3}{2}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

Choose the correct statement.

A solution formed by adding Carbon di-sulphide to Acetone forms a maximum boiling azeotrope.

Hypotonic solution is more concentrated with respect to the other solution separated by a semi permeable membrane

For a solvent, $\quad K_b=\frac{R \times M_1 \times T_b^2}{1000 \times \Delta \text { Hvap }}$ $\left(\mathrm{R}=\mathrm{Gas}\right.$ constant, $M_1=$ Molar mass of solvent, $T_b=B \cdot P$ of the solvent $)$

A 1.0 molal solution of Glucose in water is more concentrated than 1.0 M glucose solution in the same solvent.

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