Chemistry

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

22 N

33 N

11 N

44 N

Question 1 of 15

2. 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:

5.08

0.508

50.8

508

Question 2 of 15

3. The average osmotic pressure of human blood is 7.8 bar at 37°C. What is the concentration of an aqueous NaC1 solution that could be used in the blood stream?

0.60 mo1/L

0.45 mo1/L

0.31 mo1/L

0.16 mo1/L

Question 3 of 15

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:

10.5 g mol⁻¹

17.3 g mol⁻¹

15.7 g mol⁻¹

12.6 g mol⁻¹

Question 4 of 15

5. 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?

940

405

None of these

Question 5 of 15

6. 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:

0.9800 M

0.2450 M

0.6125 M

1.6326 M

Question 6 of 15

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:

267.4 g

467.4 g

356.3 g

156.6 g

Question 7 of 15

8. 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 8 of 15

9. 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

1098

998

1028

Question 9 of 15

10. An aqueous solution of hydrochloric acid

Obeys Henry’s law at all compositions

Shows negative deviation from Raoult’s law

Obeys Raoult’s law

Shows positive deviation from Raoult’s law

Question 10 of 15

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

0.1 moles/liter

0.2 moles/liter

2.0 moles/liter

1.0 moles/liter

Question 11 of 15

12. 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:

0.51 °C

5.1 °C

0.83 °C

0.051 °C

Question 12 of 15

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

Vapour pressure of pure water decreases by the addition of ethanol

Vapour pressure of pure benzene decreases by the addition of naphthalene

Boiling point of pure water decreases by the addition of ethanol

Boiling point of pure benzene increases by the addition of toluene

Question 13 of 15

14. 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)

9.26

4.74

5.00

2.26

Question 14 of 15

15. 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?

-4°C

-3°C

-2°C

+3°C

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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