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UPCET / UPSEE Boiling Point Elevation — practice questions

Explore 2 free Boiling Point Elevation questions in UPCET / UPSEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Boiling Point Elevation questions and exercises with answers

Showing questions 1–2 of 2.

The boiling point elevation $\Delta T_b$ of a dilute solution is:Read the answer and worked solution →If $K_b$ for water is 0.512 K·kg/mol, the boiling point elevation of a 0.50 molal aqueous urea solution is:Read the answer and worked solution →

Worked practice questions

The boiling point elevation $\Delta T_b$ of a dilute solution is:

  1. Directly proportional to molality
  2. Independent of molality
  3. Proportional to mole fraction of solvent
  4. Inversely proportional to molality
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Correct answer: A. Directly proportional to molality

$\Delta T_b = K_b m$, directly proportional to molality $m$. $K_b$ is the ebullioscopic (molal elevation) constant — the BP elevation produced by a 1 molal solution.

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If $K_b$ for water is 0.512 K·kg/mol, the boiling point elevation of a 0.50 molal aqueous urea solution is:

  1. 0.128 K
  2. 0.256 K
  3. 0.512 K
  4. 1.024 K
Show answer and solution

Correct answer: B. 0.256 K

$\Delta T_b = K_b m = 0.512 \times 0.50 = 0.256$ K. (Urea is a non-electrolyte, so van't Hoff factor i = 1.)

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