Critical Thinking of Solutions MCQ Basic Level

Critical thinking of Solutions MCQ Basic Level

Dear Readers,

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 17^o 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 100^o 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 K_j 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. K_j 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