Q1. Equimolar solution in the same solvent have
  •  Different boiling and different freezing points
  •  Same boiling point but different freezing point
  •  Same freezing point but different boiling point
  •  Same boiling and same freezing points
Boiling point and freezing point depend on k_b (molal elevation constant) and k_f (molal depression constant) of the solvent. Thus, equimolar solution (of the non-electrolyte) will have same boiling point and also same freezing point. ∆T_f=k_f×molality ∆T_b=k_b×molality Note In this question nature of salute has not been mentioned. Hence, we have assumed that solute is non-electrolyte.

Q2.Temperature coefficient is the variation in the :
  •  Distribution coefficient for 1 ͦ rise in the temperature
  •  Distribution coefficient for 10 ͦ rise in the temperature
  •  Concentration of solution for 1 ͦ rise in the temperature
  •  Concentration of solution for 10 ͦ rise in the temperature
Temperature coefficient = (Distribution coefficient at (t+10)°C)/(Distribution coefficient at t°C)

Q3.  What is the molarity of H_2SO_4 solution if 25 mL is exactly neutralised with 32.63 mL of 0.164 M NaOH?
  •   -0.428 M
  •  0.214 M
  •  0.126 M
  •  0.107 M

Q4. Which of the following solution in water possesses the lowest vapour pressure?
  •  None of these
  •  0.1 (M) KCl
  •  0.1 (M)NaCl
  •  0.1 (N) BaCl_2
BaCl_2gives maximum ion hence, it shows lowest vapour pressure

Q5.Which of the following is incorrect?
  •  0.1 m ethanol
  •  0.1 m glucose
  •  0.1 m urea
  •  0.1 m sucrose
 Sucrose, urea and glucose are non-electrolytes. They do not dissociate but ethanol dissociates intoC_2 H_5 O^- and H^+ ions, so, it has highest number of ions among given choices. (Colligative property ∝ number of ions of solute.)

Q6. Which method cannot be used to find out the molecular weight of non-volatile solute?
  •  Osmotic pressure method
  •  Victor Meyer’s method
  • Cryoscopic method
  •  Ebullioscopic method
Victor Meyer’s method is used for volatile solutes. Rest all are used for non-volatile solute.

Q7.At a suitable pressure near the freezing point of ice, there exists :
  •  Only ice
  •  Ice and water
  •  Ice, water and vapours, all existing side by side
  •  Ice and vapour
At triple point, all the three phase exist together. (P = 2.56 mm,T= 0.0098 ͦC)

Q8.The vapour pressure of two pure liquid (A) and (B) are 100 torr and 80 torr respectively. The total pressure of solution obtained by mixing 2 mole of (A) and 3 mole of (B) would be :
  •  120 torr
  •  88 torr
  •  180 torr
  •  36 torr

Q9.Which statement is not correct if two immiscible liquids of mol. wt. A and B respectively are mixed in equal amount to have a mixture?
  •  (P´_A)/(P´_B )=m_B/m_A
  •  The liquid having high mol. wt. will show lower values of P´
  •  P_M= P´_A+P´_B
  •  P_M=P_A^0 (X_( A) )_l+P_B^0 (X_( B) )_l
Raoult’s law is not valid for immiscible liquid mixtures.

Q10. Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
  •  2.3077%
  •  23.077%
  •  230.77%
  • 0.23077%

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