Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
99 Percentile Qs Bank for JEE MainChemistrySolutions

Calculate the molal depression constant of a solution, which freezes at 15^ C . The latent heat of fusion is 180.7 Jg ⁻¹ .

Options

  1. A3.81 ~K molal ⁻¹
  2. B0.381 k molal ⁻¹
  3. C1.90 ~K molal ⁻¹
  4. D0.19 ~K molal ⁻¹

Correct answer

A. 3.81 ~K molal ⁻¹

Step-by-step solution

K_f= R T_f^2 1000 L_f Where, aligned K_f & = molal depression constant R & = gas constant =8.314 JK ⁻¹ ~mol ⁻¹ T_f & = freezing point =273+15=288 ~K L_f & = latent heat of fusion =180.73 Jg ⁻¹ K_f & = 8.314 (288)^2 1000 180.7 = 8.314 82944 1807 & = 68959 18070 =3.81 ~K molal ⁻¹ aligned

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 99 Percentile Qs Bank for JEE Main PYQs