50 Single Choice Questions on Solution Concentration

Section A: Questions

1. What is the molarity of 5.85 g NaCl dissolved in 500 mL of solution? (MNaCl = 58.5)
A. 0.1 M     B. 0.2 M     C. 0.5 M     D. 1.0 M
2. The unit of molality is:
A. mol/L     B. mol/kg     C. g/L     D. mol/mL
3. A solution contains 20 g of solute in 500 mL. The concentration in g/L is:
A. 20 g/L     B. 40 g/L     C. 10 g/L     D. 50 g/L
4. What does 1 ppm equal to?
A. 1 g/L     B. 1 mg/L     C. 1 µg/L     D. 1 ng/L
5. 1 ppb is equivalent to:
A. 1 mg/L     B. 1 µg/L     C. 1 ng/L     D. 1 g/L
6. The density of a solution is 1.2 g/mL. What is the mass of 250 mL of this solution?
A. 200 g     B. 250 g     C. 300 g     D. 350 g
7. What is the normality of 1 M Hâ‚‚SOâ‚„?
A. 0.5 N     B. 1.0 N     C. 2.0 N     D. 4.0 N
8. A 10% w/w solution means:
A. 10 g solute in 100 g solution     B. 10 g solute in 90 g solvent
C. 10 g solute in 100 g solvent     D. 10 g solute in 1000 g solution
9. 100 mL of 5 M HCl is diluted to 500 mL. The final molarity is:
A. 0.5 M     B. 1.0 M     C. 2.0 M     D. 2.5 M
10. The equivalent weight of NaOH (M = 40) is:
A. 20 g/eq     B. 40 g/eq     C. 80 g/eq     D. 23 g/eq
11. Which concentration unit is temperature independent?
A. Molarity     B. Normality     C. Molality     D. g/L
12. 0.5 mol of glucose is dissolved in 1000 g of water. The molality is:
A. 0.5 m     B. 1.0 m     C. 0.05 m     D. 5.0 m
13. What volume of 2 M HCl is needed to prepare 200 mL of 0.5 M HCl?
A. 25 mL     B. 50 mL     C. 100 mL     D. 150 mL
14. 200 mL of 3 M HCl is mixed with 300 mL of 1 M HCl. The final molarity is:
A. 1.8 M     B. 2.0 M     C. 2.2 M     D. 2.5 M
15. In the neutralization H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O, what is the molar ratio?
A. 1:1     B. 1:2     C. 2:1     D. 2:2
16. 25 mL of 1 M Hâ‚‚SOâ‚„ neutralizes how much volume of 1 M NaOH?
A. 25 mL     B. 50 mL     C. 12.5 mL     D. 100 mL
17. A solution contains 5 mg of solute in 2 L of solution. The concentration in ppm is:
A. 2.5 ppm     B. 5 ppm     C. 10 ppm     D. 0.5 ppm
18. What is the molarity of 4.9 g Hâ‚‚SOâ‚„ in 250 mL solution? (MHâ‚‚SOâ‚„ = 98)
A. 0.1 M     B. 0.2 M     C. 0.5 M     D. 1.0 M
19. The unit of density is:
A. g/mol     B. g/mL     C. mol/L     D. L/mol
20. 1 equivalent of HCl equals how many moles?
A. 0.5 mol     B. 1 mol     C. 2 mol     D. 0.1 mol
21. A 20% v/v solution of ethanol contains:
A. 20 mL ethanol in 100 mL solution     B. 20 mL ethanol in 80 mL water
C. 20 mL ethanol in 20 mL water     D. 20 mL ethanol in 120 mL solution
22. When 500 mL of 4 N HCl is mixed with 500 mL of 2 N HCl, the final normality is:
A. 2 N     B. 3 N     C. 4 N     D. 6 N
23. What is the equivalent weight of H₃PO₄ (M = 98) in complete neutralization?
A. 98 g/eq     B. 49 g/eq     C. 32.67 g/eq     D. 196 g/eq
24. 100 mL of 6 M HCl is diluted with 400 mL of water. The final molarity is:
A. 1.0 M     B. 1.2 M     C. 1.5 M     D. 2.0 M
25. Which has the highest concentration?
A. 1000 ppm     B. 0.1% w/w     C. 1 g/L     D. All are equal
26. The normality of 0.5 M H₃PO₄ is:
A. 0.5 N     B. 1.0 N     C. 1.5 N     D. 2.0 N
27. 50 mL of 1 M HCl neutralizes 25 mL of NaOH. The molarity of NaOH is:
A. 0.5 M     B. 1.0 M     C. 2.0 M     D. 4.0 M
28. A solution has a density of 1.05 g/mL and contains 10% w/w NaOH. Its molarity is: (MNaOH = 40)
A. 2.0 M     B. 2.5 M     C. 2.625 M     D. 3.0 M
29. What remains constant during dilution?
A. Volume     B. Concentration     C. Moles of solute     D. Density
30. 1 ppb of fluoride in water means:
A. 1 mg/L     B. 1 µg/L     C. 1 ng/L     D. 1 g/L
31. The molarity of pure water (density = 1 g/mL) is:
A. 18 M     B. 55.6 M     C. 1000 M     D. 1 M
32. 1 milliequivalent equals:
A. 0.001 eq     B. 0.01 eq     C. 0.1 eq     D. 1 eq
33. In the reaction HCl + NaOH → NaCl + H₂O, 36.5 g HCl neutralizes:
A. 20 g NaOH     B. 40 g NaOH     C. 80 g NaOH     D. 23 g NaOH
34. A 5% w/v solution of glucose contains:
A. 5 g glucose in 100 g solution     B. 5 g glucose in 100 mL solution
C. 5 g glucose in 95 mL water     D. 5 mL glucose in 100 mL solution
35. What volume of 10 M Hâ‚‚SOâ‚„ is required to prepare 250 mL of 2 M Hâ‚‚SOâ‚„?
A. 25 mL     B. 50 mL     C. 100 mL     D. 125 mL
36. 100 mL of 1 N HCl + 200 mL of 2 N HCl gives final normality:
A. 1.33 N     B. 1.5 N     C. 1.67 N     D. 2.0 N
37. The molality of 1 M NaCl solution (density = 1.04 g/mL) is approximately:
A. 0.96 m     B. 1.0 m     C. 1.04 m     D. 1.08 m
38. 20 g of NaOH is dissolved in 180 g of water. The mass percent is:
A. 10%     B. 11.11%     C. 20%     D. 9.09%
39. For trace metal analysis in water, which unit is most appropriate?
A. g/L     B. mg/L     C. ppb     D. % w/w
40. 1 mol of Hâ‚‚SOâ‚„ in acid-base neutralization provides:
A. 1 equivalent     B. 2 equivalents     C. 3 equivalents     D. 0.5 equivalents
41. A solution contains 0.1 mol of solute in 500 g of solvent. The molality is:
A. 0.1 m     B. 0.2 m     C. 0.5 m     D. 1.0 m
42. When 200 mL of 0.5 M HCl neutralizes 100 mL of Ba(OH)â‚‚, the molarity of Ba(OH)â‚‚ is:
A. 0.25 M     B. 0.5 M     C. 1.0 M     D. 2.0 M
43. 250 mL of 4 M HCl is diluted to 1000 mL. The final molarity is:
A. 0.5 M     B. 1.0 M     C. 1.5 M     D. 2.0 M
44. The concentration of COâ‚‚ in air is 400 ppm. This equals:
A. 0.04%     B. 0.4%     C. 4%     D. 40%
45. 73 g of HCl (M = 36.5) dissolved in water to make 500 mL solution. The normality is:
A. 2 N     B. 4 N     C. 6 N     D. 8 N
46. Equal volumes of 1 M HCl and 1 M NaOH are mixed. The resulting solution is:
A. Acidic     B. Basic     C. Neutral     D. Cannot determine
47. 15 g of glucose (M = 180) is dissolved in 250 mL of solution. The molarity is:
A. 0.25 M     B. 0.33 M     C. 0.5 M     D. 1.0 M
48. Which expression represents normality?
A. (Molarity × n-factor)     B. (Molarity ÷ n-factor)
C. (Molality × n-factor)     D. (Molality ÷ n-factor)
49. 10 mL of 0.1 M Hâ‚‚SOâ‚„ neutralizes 20 mL of NaOH. The molarity of NaOH is:
A. 0.05 M     B. 0.1 M     C. 0.2 M     D. 0.4 M
50. A water sample contains 50 μg/L of arsenic. This concentration in ppb is:
A. 0.05 ppb     B. 0.5 ppb     C. 5 ppb     D. 50 ppb

Section B: Answer Key

Q. No. Answer Q. No. Answer Q. No. Answer Q. No. Answer Q. No. Answer
1B11C21A31B41B
2B12A22B32A42B
3B13B23C33B43B
4B14A24B34B44A
5B15B25D35B45B
6C16B26C36C46C
7C17A27C37A47B
8A18B28C38A48A
9B19B29C39C49B
10B20B30B40B50D
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