Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202225 Jun 2022Evening ShiftChemistrySolutionsActual

Solute A associates in water. When 0 . 7 g of solute A is dissolved in 42 . 0 g of water, it depresses the freezing point by 0 . 2 ° C . The percentage association of solute A in water, is [Given: Molar mass of A = 93 g mol - 1 . Molal depression constant of water is 1 . 86 K kg mol - 1 ]

Options

  1. A50 %
  2. B60 %
  3. C70 %
  4. D80 %

Correct answer

D. 80 %

Step-by-step solution

Depression in freezing point, ΔT f = iK f × m 2 . 0 = ix 1 . 86 × 7 × 1000 93 × 42 2 . 0 = i 3 . 33 i = 0 . 6 i = 1 + 1 n - 1 β 0 . 6 = 1 + 1 2 - 1 β β = 0 . 8 % β = 80 Hence, the percentage association of solute A in water is 80.

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 2 C + 2 D B , C and D are non-volatile in nature. The molar mass of B is 10 times the molar ma 2026Passage: Two volatile liquids A and B form an ideal solution. Consider a 5 molal solution of B in A inside a closed container having a total vapour pressure of 100 mm Hg at 300 K. 2026Passage: Two volatile liquids A and B form an ideal solution. Consider a 5 molal solution of B in A inside a closed container having a total vapour pressure of 100 mm Hg at 300 K. 2026Given below are two statements: Given: Molar mass of C, H, O, Cl are 12, 1, 16 and 35.5 g mol ⁻¹ , respectively. Statement I: In 30 % (w/w) solution of methanol in CCl ₄ (at T K), 2026Which of the following statements are not correct? A. For water, magnitude of K_b is more than the magnitude of K_f . B. The elevation in boiling point of water when a non-volatile 2026Given below are two statements : Statement I : H₂ O molecules move from the chamber 1 to chamber 2 . Statement II : The osmotic pressure of a solution prepared by dissolving 50 mg 2026When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was x % of vapor pressure of pure solvent. What is x % ? 202620 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height of solution in a tube dipped in a solution 2026 Full Solutions list All JEE Main PYQs