Solutions
Q. What is the percentage concentration of a solution containing 15 g of solute in 150 g of solution? (2023)
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A.
10%
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B.
15%
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C.
20%
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D.
25%
Solution
Percentage concentration = (mass of solute / mass of solution) × 100 = (15 g / 150 g) × 100 = 10%
Correct Answer: B — 15%
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Q. What is the percentage concentration of a solution containing 20 g of solute in 200 g of solution? (2021)
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A.
10%
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B.
20%
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C.
5%
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D.
15%
Solution
Percentage concentration = (mass of solute / mass of solution) × 100 = (20 g / 200 g) × 100 = 10%.
Correct Answer: A — 10%
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Q. What is the term for a solution that contains the maximum amount of solute that can dissolve at a given temperature? (2022)
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A.
Unsaturated solution
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B.
Saturated solution
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C.
Supersaturated solution
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D.
Concentrated solution
Solution
A saturated solution is one that contains the maximum amount of solute that can dissolve at a specific temperature.
Correct Answer: B — Saturated solution
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Q. What is the volume of 1 M HCl solution needed to obtain 0.5 moles of HCl? (2022)
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A.
0.5 L
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B.
1 L
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C.
2 L
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D.
0.25 L
Solution
Volume = moles / molarity = 0.5 moles / 1 M = 0.5 L.
Correct Answer: A — 0.5 L
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Q. What is the volume of a 2 M NaOH solution needed to obtain 4 moles of NaOH? (2021) 2021
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A.
2 L
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B.
1 L
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C.
0.5 L
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D.
4 L
Solution
Volume (L) = moles / molarity = 4 moles / 2 M = 2 L.
Correct Answer: A — 2 L
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Q. Which of the following is an example of a colligative property? (2021)
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A.
Boiling point elevation
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B.
Density
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C.
Color
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D.
pH
Solution
Colligative properties depend on the number of solute particles in a solution, and boiling point elevation is one such property.
Correct Answer: A — Boiling point elevation
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