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WBJEE Solutions — practice questions — page 4

Explore 109 free Solutions questions in WBJEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Showing questions 91–109 of 109.

Two volatile liquids A (P°_A = 100) and B (P°_B = 200) form ideal solution. For x_A = 0.4, total vapor pressure:Read the answer and worked solution →Osmotic pressure of 0.01 M sucrose solution at 27°C (R = 0.0821 L atm/mol K):Read the answer and worked solution →For solution of urea (M_w = 60 g/mol) with 6 g in 100 g water, molality:Read the answer and worked solution →For 0.1 M acetic acid (Ka = 1.8 × 10⁻⁵), van't Hoff factor i is:Read the answer and worked solution →For salt CaCl₂ (assume full dissociation), i =Read the answer and worked solution →For a 1 m glucose aqueous solution (i = 1), boiling point:Read the answer and worked solution →Freezing-point depression and elevation are colligative properties: depend on:Read the answer and worked solution →Complete the two concentration definitionsRead the answer and worked solution →Molarity or molality?Read the answer and worked solution →True or false: concentrationRead the answer and worked solution →Naming the measureRead the answer and worked solution →Complete the meaning of colligativeRead the answer and worked solution →True or false: colligative propertiesRead the answer and worked solution →Tap every statement true of molalityRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Flip and pair: measure with its denominatorRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →

Worked practice questions

Two volatile liquids A (P°_A = 100) and B (P°_B = 200) form ideal solution. For x_A = 0.4, total vapor pressure:

  1. 150
  2. 100
  3. 160 (= 100 × 0.4 + 200 × 0.6)
  4. 300
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Correct answer: C. 160 (= 100 × 0.4 + 200 × 0.6)

P_total = P°_A x_A + P°_B x_B = 100 × 0.4 + 200 × 0.6 = 40 + 120 = 160 mmHg. (Linear in composition for ideal mixtures.)

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Osmotic pressure of 0.01 M sucrose solution at 27°C (R = 0.0821 L atm/mol K):

  1. 1 atm
  2. 0.246 atm (= 0.01 × 0.0821 × 300)
  3. 2.46 atm
  4. 0.0821 atm
Show answer and solution

Correct answer: B. 0.246 atm (= 0.01 × 0.0821 × 300)

π = MRT = 0.01 × 0.0821 × 300 = 0.246 atm. (Even dilute solutions can have substantial osmotic pressures, hence important for cells: isotonic saline ≈ 0.9% NaCl.)

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For solution of urea (M_w = 60 g/mol) with 6 g in 100 g water, molality:

  1. 1 m
  2. 6 m
  3. 1 m (= 6/60 / 0.1 kg water)
  4. 0.1 m
Show answer and solution

Correct answer: C. 1 m (= 6/60 / 0.1 kg water)

Moles urea = 6/60 = 0.1 mol. Kg water = 0.1. Molality = 0.1/0.1 = 1 mol/kg. ΔT_f = 1.86 × 1 = 1.86 K (freezing pt = -1.86°C).

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More Chemistry topics

Ideal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionElectrochemistryElectrochemical SeriesCoordination CompoundsSurface Chemistry