COMEDK · Chemistry · 17. Solutions

Choose the correct statement.

A For a solvent, \(\quad K_b=\dfrac{R \times M_1 \times T_b^2}{1000 \times \Delta \text { Hvap }}\)
\(\left(\mathrm{R}=\right.\) Gas constant, \(M_1=\) Molar mass of solvent, \(T_b=B . P\) of the solvent \()\)
B Hypotonic solution is more concentrated with respect to the other solution separated by a semi permeable membrane
C A 1.0 molal solution of Glucose in water is more concentrated than 1.0 M glucose solution in the same solvent.
D A solution formed by adding Carbon di-sulphide to Acetone forms a maximum boiling azeotrope.

Verified Solution

Answer & Solution

Correct Answer

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

Step-by-step Solution

Detailed explanation

(1) Correct: \(K_b = \dfrac{R \times M_1 \times T_b^2}{1000 \times \Delta H_{vap}}\) is the standard thermodynamic expression for the ebullioscopic constant, where \(R\) is the gas constant, \(M_1\) is the molar mass of solvent, \(T_b\) is the boiling point of pure solvent, and…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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