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Question (11)

QN0029065

Which pair represents an unsaturated solution?

(A) Solute settling at bottom
(B) More solute can dissolve
(C) Solute visible separately
(D) Solvent completely evaporated

Correct Answer: B

Explanation:

More solute can still dissolve in an unsaturated solution.

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Question (12)

QN0029066

A student prepares four solutions using 100 mL water each with 2 g, 4 g, 6 g and 8 g salt. Which is the most concentrated?

(A) 2 g
(B) 4 g
(C) 6 g
(D) 8 g

Correct Answer: D

Explanation:

Highest solute amount gives highest concentration.

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Question (13)

QN0029067

Which of the following is a relative term according to the chapter?

(A) Solubility
(B) Saturation
(C) Dilute and concentrated
(D) Temperature

Correct Answer: C

Explanation:

Dilute and concentrated are relative terms.

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Question (14)

QN0029068

A solution contains 18 g solute in 90 mL solvent. Another contains 20 g solute in 200 mL solvent. Which is more concentrated?

(A) First
(B) Second
(C) Both equal
(D) Cannot be compared

Correct Answer: A

Explanation:

18/90 = 0.2 and 20/200 = 0.1.

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Question (15)

QN0029069

Water can dissolve only a fixed maximum amount of salt at a given temperature. This property is known as:

(A) concentration
(B) solubility
(C) density
(D) diffusion

Correct Answer: B

Explanation:

The maximum dissolving capacity is called solubility.

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Question (16)

QN0029070

A solution contains 16 g salt in 80 mL water. If another 80 mL water is added, the solution becomes:

(A) more concentrated
(B) saturated
(C) less concentrated
(D) unchanged

Correct Answer: C

Explanation:

Increasing solvent decreases concentration.

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Question (17)

QN0029071

A solution contains 25 g sugar in 100 mL water. Another contains 30 g sugar in 150 mL water. Which is more concentrated?

(A) First
(B) Second
(C) Equal
(D) None

Correct Answer: A

Explanation:

25/100 = 0.25 and 30/150 = 0.2.

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Question (18)

QN0029072

If 30 g of a solute is the maximum amount that dissolves in 100 mL water at a certain temperature, adding 35 g solute will leave:

(A) 35 g undissolved
(B) 30 g undissolved
(C) 5 g undissolved
(D) No undissolved solute

Correct Answer: C

Explanation:

Only 30 g dissolves, leaving 5 g undissolved.

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Question (19)

QN0029073

Which observation indicates that water has reached its limit to dissolve salt?

(A) Water changes colour
(B) Salt begins floating
(C) Undissolved salt remains at bottom
(D) Water starts boiling

Correct Answer: C

Explanation:

Undissolved salt indicates saturation.

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Question (20)

QN0029074

A solution has 10 g solute in 50 mL solvent. Another has 30 g solute in 200 mL solvent. Which is more concentrated?

(A) First
(B) Second
(C) Both equal
(D) Cannot be compared

Correct Answer: A

Explanation:

10/50 = 0.2 and 30/200 = 0.15.

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Question (11)

Which pair represents an unsaturated solution?

Explanation:

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Question (12)

A student prepares four solutions using 100 mL water each with 2 g, 4 g, 6 g and 8 g salt. Which is the most concentrated?

Explanation:

Link:

Question (13)

Which of the following is a relative term according to the chapter?

Explanation:

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Question (14)

A solution contains 18 g solute in 90 mL solvent. Another contains 20 g solute in 200 mL solvent. Which is more concentrated?

Explanation:

Link:

Question (15)

Water can dissolve only a fixed maximum amount of salt at a given temperature. This property is known as:

Explanation:

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Question (16)

A solution contains 16 g salt in 80 mL water. If another 80 mL water is added, the solution becomes:

Explanation:

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Question (17)

A solution contains 25 g sugar in 100 mL water. Another contains 30 g sugar in 150 mL water. Which is more concentrated?

Explanation:

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Question (18)

If 30 g of a solute is the maximum amount that dissolves in 100 mL water at a certain temperature, adding 35 g solute will leave:

Explanation:

Link:

Question (19)

Which observation indicates that water has reached its limit to dissolve salt?

Explanation:

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Question (20)

A solution has 10 g solute in 50 mL solvent. Another has 30 g solute in 200 mL solvent. Which is more concentrated?

Explanation:

Link:

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