QUIZ-I
Q:1. Which salt may show the same value of vant Hoff factor (i) as that of K4Fe(CN)6 in very dilute solution state:
(A) Al2(SO4)3
(B) NaCl
(C) Al(NO3)3
(D) Na2SO4
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Q:2. Two solutions of KNO3 and CH3COOH are prepared separately. Molarity of both is 0.1 M and osmotic pressures are P1 and P2 respectively. The correct relationship between the osmotic pressures is:
(A) P2 > P1
(B) P1 = P2
(C) P1 > P2
(D) $\large \frac{P_1}{P_1 + P_2} = \frac{P_2}{P_1 + P_2} $
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Q:3. The process of getting fresh water from sea water is known as
(A) Osmosis
(B) Filtration
(C) Desaltation
(D) Reverse Osmosis
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Q:4. Equimolal solutions of A and B show depression in freezing point in the ratio 2:1. A remains in its normal state in solution. B will be …….. state
(A) Normal
(B) Dissociated
(C) Associated
(D) Hydrolysis
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Q:5. The wt. of urea dissolved in 100 ml solution which produce an osmotic pressure of 20.4 atm, will be
(A) 5 g
(B) 4 g
(C) 3 g
(D) 6 g
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Q:6. Which of the following solution will have highest freezing point ?
(A) 2 M NaCl solution
(B) 1.5 M AlCl3 solution
(C) 1 M Al2(SO4)3 Solution
(D) 3 M Urea Solution
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Q:7. The degree of dissociation (α) of a weak electrolyte AxBy is related to Vant’s Hoff factor(i) by the expression
(A) $\large \alpha = \frac{i+1}{x+y-1} $
(B) $\large \alpha = \frac{i-1}{x+y-1} $
(C) $\large \alpha = \frac{x+y-1}{i-1} $
(D) $\large \alpha = \frac{x+y+1}{i-1} $
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Q:8. The freezing point of 0.05 m solutions of a non-electrolyte in water is
(A) –1.86°C
(B) –0.93°C
(C) –0.093°C
(D) 0.93°C
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Q:9. Which of the following aqueous solutions has osmotic pressure nearest to that of an equimolar solution of K4[Fe(CN)6]
(A) Na2SO4
(B) BaCl2
(C) Al2(SO4)3
(D)C12H22O11
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Q:10. 0.48 g of a substance is dissolved in 10.6 g of C6H6 . The freezing point of benzene is lowered by 1.8°C. What will be the mol. wt. of the substance (Kf for benzene = 5)
(A) 250.2
(B) 90.8
(C) 125.79
(D) 102.5
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Q:11. Which aqueous solution would posses the lowest boiling point.
(A) 1 $ NaCl solution
(B) 1 % Urea solution
(B) 1 % Glucose solution
(D) 1 % Sucrose solution
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Q:12. The relationship between Osmotic pressure at 273 K when 10 gm of glucose (P1), 10 gm urea (P2) and 10 gm sucrose (P3) are dissolved in 250 ml of water is
(A) P1 > P2 > P3
(B) P3 > P1 > P2
(C) P2 > P1 > P3
(D) P2 > P3 > P1
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Q:13. In which mode of expression of concentration of a solution remains independent of temperature ?
(A) Molarity
(B) Normality
(C) Formality
(D) Molality
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Q:14. An aqueous solution boils at 100.50°C. The freezing point of the solution would be (Kb for water = 0.51°C/m), (Kf for water = 1.86°C/m) [No association or dissociation]
(A) 0°C
(B) -1.86°C
(C) -1.82°C
(D) +1.82°C
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Q:15. An ideal solution has equal mol-fractions of two volatile components A and B. In the vapour above the solution, the mol-fractions of A and B:
(A) Are both 0.50
(B) Are equal but necessarily 0.50
(C) Are not very likely to be equal
(D) Are 1.00 and 0.00 respectively
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11.(D) 12.(C) 13.(D) 14.(B) 15.(C)