Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202624 JanuaryMorning Shift
Exam
JEE Main
Year
2026
Date
24 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Solutions

JEE Main 2026 · 24 January · Morning Shift · Chemistry · Solutions

A solution is prepared by dissolving 0.3 g of a non-volatile...

A solution is prepared by dissolving 0.3 g of a non-volatile non-electrolyte solute 'A' of molar mass 60 g mol−160 \mathrm{~g} \mathrm{~mol}^{-1} and 0.9 g of a non-volatile non-electrolyte solute ' BB ' of molar mass 180 g mol−1180 \mathrm{~g} \mathrm{~mol}^{-1} in 100 mLH2O100 \mathrm{~mL} \mathrm{H}_{2} \mathrm{O} at 27∘C27^{\circ} \mathrm{C}. Osmotic pressure of the solution will be
[Given: R=0.082 L atm K−1 mol−1\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}]

Options

  1. A0.82 atm
  2. B2.46 atm
  3. C1.23 atm
  4. D1.47 atm

Correct answer

B. 2.46 atm

Step-by-step solution

Calculate osmotic pressure using π=nRTV\pi = \frac{nRT}{V} where n is total moles of solute particles.
Moles of solute A: nA=0.3 g60 g/mol=0.005n_A = \frac{0.3 \text{ g}}{60 \text{ g/mol}} = 0.005 mol
Moles of solute B: nB=0.9 g180 g/mol=0.005n_B = \frac{0.9 \text{ g}}{180 \text{ g/mol}} = 0.005 mol
Total moles: ntotal=0.005+0.005=0.01n_{total} = 0.005 + 0.005 = 0.01 mol
Volume of solution: 100 mL = 0.1 L
Temperature: 27°C = 300 K
Osmotic pressure: π=0.01×0.082×3000.1=0.2460.1=2.46\pi = \frac{0.01 \times 0.082 \times 300}{0.1} = \frac{0.246}{0.1} = 2.46 atm
Practice Solutions on Quantrex Academy →

More from Solutions

In a solvent S , a compound B is partially dissociated into C and D as given below: B… JEE Advanced 2026Passage: Two volatile liquids A and B form an ideal solution. Consider a 5 molal solution… JEE Advanced 2026Passage: Two volatile liquids A and B form an ideal solution. Consider a 5 molal solution… JEE Advanced 2026Given below are two statements: Given: Molar mass of C, H, O, Cl are 12, 1, 16 and 35.5 g… JEE Main 2026Which of the following statements are not correct? A. For water, magnitude of K_b is more… JEE Main 2026Given below are two statements : Statement I : H _2 O molecules move from the chamber 1… JEE Main 2026When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a… JEE Main 202620 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by… JEE Main 2026 Full Solutions list All JEE Main PYQs