Class 12 Solutions Mock Test (CBSE)

Topics in Solutions

• Types of solutions
• Expressing concentration of solutions
• Solubility of solids and gases
• Henry's law
• Vapour pressure of liquid solutions
• Raoult's law
• Ideal and non-ideal solutions
• Colligative properties
• Relative lowering of vapour pressure
• Elevation of boiling point
• Depression of freezing point
• Osmosis and osmotic pressure
• Abnormal molar masses and van't Hoff factor

Solutions practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following aqueous solutions will exhibit the highest osmotic pressure at a given temperature?

   1. (a)$0.1\text{ M } \text{Al}_2(\text{SO}_4)_3$
   2. (b)$0.1\text{ M } \text{Glucose}$
   3. (c)$0.1\text{ M } \text{BaCl}_2$
   4. (d)$0.1\text{ M } \text{NaCl}$
   Show answer and step marks

   1. Correct option: (a). Osmotic pressure is a colligative property directly proportional to the van't Hoff factor ($i$) and concentration. $\text{Al}_2(\text{SO}_4)_3$ dissociates into 5 ions, giving the highest van't Hoff factor ($i = 5$) among the given solutions.+1

   Answer: (a)
2. Q2Multiple choice·1 mark
   When ethanoic acid is dissolved in benzene, it undergoes dimerization. The van't Hoff factor ($i$) for this solution is expected to be:

   1. (a)Equal to $1$
   2. (b)Less than $1$
   3. (c)Greater than $1$
   4. (d)Equal to $2$
   Show answer and step marks

   1. Correct option: (b). Solutes that undergo association in solution have a van't Hoff factor ($i$) less than $1$ because the total number of effective particles decreases due to dimerization.+1

   Answer: (b)

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