Chemistry Solution And Liquid State Test Online MCQs

1. 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]

2. The molarity of H₂SO₄ solution, which has a density 1.84 g/cc. at 35°C and contains 98% by weight, is:

3. A solution is prepared by dissolving 24.5 g of sodium hydroxide in distilled water to give 1 L solution. The molarity of NaOH in the solution is:

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

5. 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:

6. Temperature does not affect:

7. 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

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

9. 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)

10. 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: 

11. Which of the following pairs of solutions are expected to be isotonic, temperature being the same?

12. 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?

13. 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:

14. 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?

15. An aqueous solution of hydrochloric acid