Critical thinking of Solutions MCQ Basic Level

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. On adding solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is

•  0.25
•  0.75
•  0.50
•  0.33

0.25

Q2. Azeotropic mixture of HCl and water has

•  84% HCl
•  22.2% HCl
•  63% HCl
•  20.2% HCl

20.2% HCl

Q3. The osmotic pressure at 17o C of an aqueous solution containing 1.75 g of sucrose per 150 ml solution is

•  0.8 atm
•  0.08 atm
•  8.1 atm
•  9.1 atm

0.8 atm

Q4. A 1.2 of solution of NaCl is isotonic with 7.2 of solution of glucose. Calculate the van’t Hoff’s factor of NaCl solution

•  2.36
•  1.50
•  1.95
•  1.00

1.95

Q5. The boiling point of a solution of 0.1050 gm of a substance in 15.84 gram of ether was found to be 100o C higher than that of pure ether. What is the molecular weight of the substance [Molecular elevation constant of ether per 100 g = 21.6]

•  144.50
•  143.18
•  140.28
•  146.66

143.18

Q6. Normal boiling point of water is 373 K (at 760mm). Vapour pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be

•  250 K
•  294 K
•  51.6 K
•  12.5 K

294 K

Q7. A solution is obtained by dissolving 12 g of urea (mol.wt.60) in a litre of water. Another solution is obtained by dissolving 68.4 g of cane sugar (mol.wt. 342) in a litre of water at are the same temperature. The lowering of vapour pressure in the first solution is

•  Same as that of 2nd solution
•  Nearly one-fifth of the 2nd solution
•  Double that of 2nd solution
•  Nearly five times that of 2nd solution

Same as that of 2nd solution

Q8. An aqueous solution of a weak monobasic acid containing 0.1 g in 21.7g of water freezes at 272.813 K. If the value of Kj for water is 1.86 K/m, what is the molecular mass of the monobasic acid

•  50 g/mole
•  46 g/mole
•  55 g/mole
•  60 g/mole

60 g/mole

Q9. Kj of 1,4-dioxane is 4.9 mol-1 for 1000 g. The depression in freezing point for a 0.001 m solution in dioxane is

•  0.0049
•  4.9 + 0.001
•  4.9
•  0.49

0.0049

Q10. How many litres of CO2 at STP will be formed when 100 ml of 0.1 M H2SO4 reacts with excess of Na2SO3

•  22.4
•  2.24
•  0.224
•  5.6

0.224

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Critical Thinking of Solutions MCQ Basic Level