Chemistry Solution And Liquid State Test Online MCQs

1. A 5% solution (by mass) of cane sugar in water has freezing point of 271 K and freezing point of pure water is 273.15 K. The freezing point of a 5% solution (by mass) of glucose in water is

2. At 300K, the vapour pressure of an ideal solution containing 3 mole of A and 2 mole of B is 600 torr. At the same temperature, if 1.5 mole of A and 0.5 mole of C (non-volatile) are added to this solution the vapour pressure of solution increases by 30 torr. What is the value of P⁰_B?

3. 0.450 g of urea (mol. Wt. 60) in 22.5g of water show 0.170°C of elevation in boiling point. The molal elevation constant of water is:

4. 20 g of a substance were dissolved in 500 mL of water and the osmotic pressure of the solution was found to be 600 mm of mercury at 15°C. The molecular weight of substance is:

5. 0.01 M solution of KC1 and BaC1₂ are prepared in water. The freezing point of KC1 is found to be –2°C. What is the freezing point of BaC1₂ to be completely ionised?

6. The normality of orthophosphoric acid having purity of 70% by weight and specific gravity 1.54 is:

7. The vapour pressure of benzene at 30°C is 121.8 mm. By adding 15 g of non-volatile solute in 250 g of benzene, its vapour pressure is decreased to 120.2 mm. The molecular weight of solute is: 

8. 40 m1 of 0.1 M ammonia solution is mixed with 20 m1 of 0.1 M HC1. What is the pH of the mixture? (pK_b of ammonia solution is 4.74)

9. The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78 g/mo1). The vapour pressure of the solution then is 0.845 bar. What is the molecular mass of the solid substance?

10. The molar concentration of 20 g of NaOH present in 5 liter of solution is:

11. An aqueous solution of hydrochloric acid

12. I mo1 each of the following compounds is dissolved in 1L of solution. Which will have the largest ∆T_b value?

13. Temperature does not affect:

14. Exactly 1 g of urea dissolved in 75 g of water gives a solution that boils at 100.114°C at 760 torr. The molecular weight of urea is 60.1. The boiling point elevation constant for water is

15. An aqueous solution of NaC1 shows the depression of freezing point of water equal to 0.372 K. The boiling will be BaC1₂ solution of same molality will be [Kf (H₂O) = 1.86 K kg mol⁻¹; Kb(H₂O) = 0.52 K kg mol⁻¹]