Chemistry

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

Boiling point of pure water decreases by the addition of ethanol

Vapour pressure of pure benzene decreases by the addition of naphthalene

Vapour pressure of pure water decreases by the addition of ethanol

Boiling point of pure benzene increases by the addition of toluene

Question 1 of 15

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

11 N

44 N

22 N

33 N

Question 2 of 15

3. 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:

508

5.08

50.8

0.508

Question 3 of 15

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

1.0 moles/liter

2.0 moles/liter

0.1 moles/liter

0.2 moles/liter

Question 4 of 15

5. 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:

0.83 °C

0.051 °C

5.1 °C

0.51 °C

Question 5 of 15

6. Van’t Hoff factor is:

Normal molecular mass/Observed molecular mass

More than one in case of association

Observed molecular mass/ Normal molecular mass

Less than one in case of dissociation

Question 6 of 15

7. An aqueous solution of hydrochloric acid

Obeys Henry’s law at all compositions

Obeys Raoult’s law

Shows positive deviation from Raoult’s law

Shows negative deviation from Raoult’s law

Question 7 of 15

8. 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

3.06

1.51

0.51

1.02

Question 8 of 15

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

HI.

HBr

HC1

Question 9 of 15

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

24.5 M

1.84 M

20.6 M

18.4 M

Question 10 of 15

11. 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?

180

145

170

Question 11 of 15

12. 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:

15.7 g mol⁻¹

17.3 g mol⁻¹

12.6 g mol⁻¹

10.5 g mol⁻¹

Question 12 of 15

13. 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:

1198

998

1028

1098

Question 13 of 15

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?

-2°C

+3°C

-4°C

-3°C

Question 14 of 15

15. 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

269.07 K

271 K

277.23 K

273.15 K

Question 15 of 15

Test Name	Solution And Liquid State MCQs Test
Subject	Chemistry
Test Type	MCQs
Total Question	15
Total Marks	30
Total Time	15 Mints
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Chemistry Solution And Liquid State Test Online MCQs

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