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Match the solutions in Column-I with their equivalent descriptions in Columns II and III, then identify the INCORRECT match. Column-I: (A) 2 M aqueous NaOH (density = 1.25 g/mL) (B) 1.5 m aqueous NaOH (density = 1.06 g/mL) (C) 0.5 M aqueous glucose (density = 1.09 g/mL) (D) 1.5 M aqueous urea (density = 1.15 g/mL) Column-II: (i) 2 mol solute per litre of solution (ii) 1.5 mol solute per litre of solution (iii) 0.5 mol solute per litre of solution (iv) 1.5 mol solute per kg of solvent Column-III: (I) 6% (w/v) solution (II) 8% (w/v) solution (III) 9% (w/v) solution (IV) 9 g solute per 100 g solvent Which of the following matches is incorrect?

1. A - i - II
2. B - ii - I
3. C - iii - III
4. D - iv - III

Correct answer: B - ii - I

Solution

B is a 1.5 molal NaOH solution, which corresponds to 1.5 mol per kg solvent (iv) and 6 g per 100 g solvent, so matching it to (ii) and (I) is wrong.

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