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

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

4. On mixing 3 g of non – volatile solute in 200 mL of water, its boiling point (100°C) becomes 100.52°C. If K_b for water is 0.6 K/m then molecular wt. of solute is:

5. 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:

6. Which one of the statements given below concerning properties of solutions, describes a colligative effect?

7. An aqueous solution of hydrochloric acid

8. Temperature does not affect:

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

11. 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:

12. 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:

13. Van’t Hoff factor is:

14. 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?

15. Pure benzene freezes at 5.45°C. A 0.374 m solution of tetrachloroethane in benzene freezes at 3.55°C. The K_f for benzene is: