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Question (31)

QN0029085

Which condition gives the most concentrated solution?

(A) 20 g salt in 100 mL water
(B) 20 g salt in 200 mL water
(C) 20 g salt in 300 mL water
(D) 20 g salt in 400 mL water

Correct Answer: A

Explanation:

Same solute in the least solvent gives maximum concentration.

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Question (32)

QN0029086

A solution contains 9 g solute in 45 mL solvent. Another contains 12 g solute in 80 mL solvent. Which is more concentrated?

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

Correct Answer: A

Explanation:

9/45 = 0.2 and 12/80 = 0.15.

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Question (33)

QN0029087

Which statement best explains solubility?

(A) Amount of solvent present
(B) Amount of solute that can dissolve maximally in a fixed quantity of solvent
(C) Temperature of the solution only
(D) Colour of the solution

Correct Answer: B

Explanation:

Solubility is the maximum dissolving capacity of a solvent.

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Question (34)

QN0029088

A solution has 40 g salt dissolved in 200 mL water. If another 10 g salt is added and dissolves completely, the solution becomes:

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

Correct Answer: B

Explanation:

Additional dissolved solute increases concentration.

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Question (35)

QN0029089

A student prepares Solution A with 18 g sugar in 60 mL water and Solution B with 24 g sugar in 120 mL water. Which is more concentrated?

(A) A
(B) B
(C) Both same
(D) Cannot be determined

Correct Answer: A

Explanation:

18/60 = 0.3 and 24/120 = 0.2.

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Question (36)

QN0029090

Which solution is closest to being saturated if all have the same solvent volume?

(A) 5 g dissolved
(B) 10 g dissolved
(C) 15 g dissolved
(D) 20 g dissolved and a little remains undissolved

Correct Answer: D

Explanation:

Presence of undissolved solute indicates saturation has been reached.

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Question (37)

QN0029091

A solution contains 21 g solute in 70 mL solvent. What is its concentration?

(A) 0.1 g/mL
(B) 0.2 g/mL
(C) 0.3 g/mL
(D) 0.4 g/mL

Correct Answer: C

Explanation:

21 ÷ 70 = 0.3 g/mL.

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Question (38)

QN0029092

Which situation demonstrates the practical meaning of solubility limit?

(A) Salt dissolves completely every time regardless of amount
(B) A stage comes when additional salt remains undissolved
(C) Water changes into vapour
(D) Sugar changes colour in water

Correct Answer: B

Explanation:

Solubility limit is reached when extra solute no longer dissolves.

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Question (31)

Which condition gives the most concentrated solution?

Explanation:

Link:

Question (32)

A solution contains 9 g solute in 45 mL solvent. Another contains 12 g solute in 80 mL solvent. Which is more concentrated?

Explanation:

Link:

Question (33)

Which statement best explains solubility?

Explanation:

Link:

Question (34)

A solution has 40 g salt dissolved in 200 mL water. If another 10 g salt is added and dissolves completely, the solution becomes:

Explanation:

Link:

Question (35)

A student prepares Solution A with 18 g sugar in 60 mL water and Solution B with 24 g sugar in 120 mL water. Which is more concentrated?

Explanation:

Link:

Question (36)

Which solution is closest to being saturated if all have the same solvent volume?

Explanation:

Link:

Question (37)

A solution contains 21 g solute in 70 mL solvent. What is its concentration?

Explanation:

Link:

Question (38)

Which situation demonstrates the practical meaning of solubility limit?

Explanation:

Link:

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