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Question (21)

QN0029075

Which solution is dilute?

(A) 2 g salt in 100 mL water
(B) 10 g salt in 100 mL water
(C) 20 g salt in 100 mL water
(D) 25 g salt in 100 mL water

Correct Answer: A

Explanation:

Least solute amount gives the most dilute solution.

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Question (22)

QN0029076

If the amount of solute is doubled while solvent remains the same, the solution generally becomes:

(A) more dilute
(B) more concentrated
(C) unsaturated always
(D) less soluble

Correct Answer: B

Explanation:

More solute increases concentration.

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Question (23)

QN0029077

A student compares 8 g salt in 40 mL water with 24 g salt in 120 mL water. What is the result?

(A) First more concentrated
(B) Second more concentrated
(C) Both equally concentrated
(D) Cannot be determined

Correct Answer: C

Explanation:

8/40 = 24/120 = 0.2.

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Question (24)

QN0029078

Which statement about concentration is correct?

(A) It depends only on solvent volume
(B) It depends only on solute mass
(C) It depends on amount of solute in a fixed quantity of solution
(D) It depends only on temperature

Correct Answer: C

Explanation:

Concentration depends on solute amount in a fixed quantity of solution.

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Question (25)

QN0029079

A solution contains 12 g solute in 40 mL solvent. Another contains 18 g solute in 90 mL solvent. Which is more concentrated?

(A) First
(B) Second
(C) Equal
(D) Cannot be compared

Correct Answer: A

Explanation:

12/40 = 0.3 and 18/90 = 0.2.

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Question (26)

QN0029080

If a solution can still dissolve 4 g more solute, it is:

(A) saturated
(B) unsaturated
(C) concentrated only
(D) insoluble

Correct Answer: B

Explanation:

More solute can still dissolve.

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Question (27)

QN0029081

Which solution has the least concentration?

(A) 5 g in 25 mL
(B) 10 g in 100 mL
(C) 15 g in 300 mL
(D) 20 g in 200 mL

Correct Answer: C

Explanation:

15/300 = 0.05, the smallest value.

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Question (28)

QN0029082

A student dissolves 24 g sugar in 120 mL water. What is the concentration ratio (g/mL)?

(A) 0.1
(B) 0.2
(C) 0.3
(D) 0.4

Correct Answer: B

Explanation:

24 ÷ 120 = 0.2 g/mL.

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Question (29)

QN0029083

A saturated solution at a particular temperature means:

(A) all solvent has disappeared
(B) no more solute can dissolve at that temperature
(C) concentration becomes zero
(D) solute and solvent separate completely

Correct Answer: B

Explanation:

Saturated solutions cannot dissolve more solute at that temperature.

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Question (30)

QN0029084

If the concentration of a solution is 0.25 g/mL and the solvent volume is 80 mL, the amount of solute present is:

(A) 10 g
(B) 15 g
(C) 20 g
(D) 25 g

Correct Answer: C

Explanation:

0.25 × 80 = 20 g.

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Question (21)

Which solution is dilute?

Explanation:

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Question (22)

If the amount of solute is doubled while solvent remains the same, the solution generally becomes:

Explanation:

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Question (23)

A student compares 8 g salt in 40 mL water with 24 g salt in 120 mL water. What is the result?

Explanation:

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Question (24)

Which statement about concentration is correct?

Explanation:

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Question (25)

A solution contains 12 g solute in 40 mL solvent. Another contains 18 g solute in 90 mL solvent. Which is more concentrated?

Explanation:

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Question (26)

If a solution can still dissolve 4 g more solute, it is:

Explanation:

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Question (27)

Which solution has the least concentration?

Explanation:

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Question (28)

A student dissolves 24 g sugar in 120 mL water. What is the concentration ratio (g/mL)?

Explanation:

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Question (29)

A saturated solution at a particular temperature means:

Explanation:

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Question (30)

If the concentration of a solution is 0.25 g/mL and the solvent volume is 80 mL, the amount of solute present is:

Explanation:

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