Start learning →

M.Sc Biochemistry Solutions — practice questions

Explore 19 free Solutions questions in M.Sc Biochemistry Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

Practise Solutions with Quill →

Solutions questions and exercises with answers

Showing questions 1–19 of 19.

The mole fraction of urea ($M = 60\,\text{g/mol}$) in an aqueous solution containing $6\,\text{g}$ of urea in $180\,\text{g}$ of water is approximately:Read the answer and worked solution →For an ideal solution containing two volatile liquids A and B, Raoult's law gives the total vapour pressure as:Read the answer and worked solution →Osmotic pressure of a dilute solution is expressed by van't Hoff's equation as:Read the answer and worked solution →Two solutions are said to be **isotonic** if they:Read the answer and worked solution →If $\mathrm{NaCl}$ undergoes complete dissociation in water, the van't Hoff factor $i$ is:Read the answer and worked solution →Desalination of sea water is best carried out by:Read the answer and worked solution →Rule on these claims about solutionsRead 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

The mole fraction of urea ($M = 60\,\text{g/mol}$) in an aqueous solution containing $6\,\text{g}$ of urea in $180\,\text{g}$ of water is approximately:

  1. $0.010$
  2. $0.005$
  3. $0.100$
  4. $0.050$
Show answer and solution

Correct answer: A. $0.010$

Moles of urea $= 6/60 = 0.10$. Moles of water $= 180/18 = 10.0$. Mole fraction of urea $= 0.10/(0.10 + 10.0) = 0.10/10.10 \approx 0.0099 \approx 0.010$.

Open this question →

For an ideal solution containing two volatile liquids A and B, Raoult's law gives the total vapour pressure as:

  1. $p_T = p_A^\circ p_B^\circ$
  2. $p_T = p_A^\circ \chi_B + p_B^\circ \chi_A$
  3. $p_T = p_A^\circ + p_B^\circ$
  4. $p_T = p_A^\circ \chi_A + p_B^\circ \chi_B$
Show answer and solution

Correct answer: D. $p_T = p_A^\circ \chi_A + p_B^\circ \chi_B$

**Raoult's law for an ideal solution:** each component's partial pressure equals its mole fraction in the solution times the vapour pressure of the pure component, $p_i = p_i^\circ \chi_i$. By Dalton's law the total is $p_T = p_A^\circ \chi_A + p_B^\circ \chi_B$.

Open this question →

Osmotic pressure of a dilute solution is expressed by van't Hoff's equation as:

  1. $\pi = CRT$
  2. $\pi V = nR$
  3. $\pi = nRT$
  4. $\pi = RT/C$
Show answer and solution

Correct answer: A. $\pi = CRT$

For a dilute solution behaving ideally, $\pi = C R T$, where $C$ is the molar concentration of solute, $R$ the gas constant and $T$ the absolute temperature. Equivalently $\pi V = n R T$, structurally identical to the ideal-gas equation with osmotic pressure playing the role of $p$.

Open this question →

How to practise

  1. Choose a Solutions question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Chemistry topics

ChemistryStructure of AtomAtomic combinationsAtoms and ElementsClass9 Atom StructureJEE Main 2023 MixedAtomic StructureAtomic Structure and Valency