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Question (31)

QN0029123

Which condition causes dissolved gases to escape most rapidly?

(A) Low temperature and high pressure
(B) High temperature and low pressure
(C) Low temperature and low pressure
(D) High pressure and low temperature

Correct Answer: B

Explanation:

High temperature and low pressure reduce gas solubility.

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Question (32)

QN0029124

A bottle contains 18 g dissolved gas. After cooling, the amount rises to 24 g under the same pressure. How much additional gas dissolved?

(A) 4 g
(B) 5 g
(C) 6 g
(D) 7 g

Correct Answer: C

Explanation:

24 − 18 = 6 g.

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Question (33)

QN0029125

Why is dissolved oxygen important in lakes and rivers?

(A) It helps aquatic animals respire
(B) It changes water colour
(C) It reduces water volume
(D) It increases salinity

Correct Answer: A

Explanation:

Aquatic animals use dissolved oxygen for respiration.

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Question (34)

QN0029126

A water sample contains 16 mg/L dissolved oxygen. Another contains 12 mg/L. Which sample is likely to support aquatic life better?

(A) First sample
(B) Second sample
(C) Both equally
(D) Neither

Correct Answer: A

Explanation:

Higher dissolved oxygen is better for aquatic organisms.

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Question (35)

QN0029127

Which pair correctly matches the gas and its common role?

(A) Oxygen—fizz in soft drinks
(B) Carbon dioxide—respiration of fish
(C) Carbon dioxide—carbonated drinks
(D) Nitrogen—aquatic respiration

Correct Answer: C

Explanation:

Carbon dioxide is used in carbonated beverages.

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Question (36)

QN0029128

Dissolved oxygen decreases from 15 mg/L to 12 mg/L after warming. What percentage decrease occurred?

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

Correct Answer: C

Explanation:

(3/15) × 100 = 20%.

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Question (37)

QN0029129

Which condition would contain the least dissolved oxygen?

(A) Cold lake water
(B) Water under higher pressure
(C) Warm pond water
(D) Deep cool reservoir water

Correct Answer: C

Explanation:

Warm water holds less dissolved oxygen.

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Question (38)

QN0029130

A carbonated drink contains 28 units of dissolved CO₂. If 25% escapes after opening, how many units remain dissolved?

(A) 7
(B) 14
(C) 21
(D) 24

Correct Answer: C

Explanation:

75% of 28 = 21 units.

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Question (39)

QN0029131

A scientist compares two containers. Container A has 18 units of dissolved gas at high pressure. Container B has 12 units at low pressure. How much more gas is dissolved in A?

(A) 4 units
(B) 5 units
(C) 6 units
(D) 7 units

Correct Answer: C

Explanation:

18 − 12 = 6 units.

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Question (40)

QN0029132

Which real-life example best demonstrates the effect of pressure on gas solubility?

(A) Sugar dissolving in tea
(B) Salt dissolving in water
(C) Carbonated soft drinks stored in sealed bottles
(D) Sand settling in water

Correct Answer: C

Explanation:

Soft drinks are stored under pressure to keep carbon dioxide dissolved.

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Question (31)

Which condition causes dissolved gases to escape most rapidly?

Explanation:

Link:

Question (32)

A bottle contains 18 g dissolved gas. After cooling, the amount rises to 24 g under the same pressure. How much additional gas dissolved?

Explanation:

Link:

Question (33)

Why is dissolved oxygen important in lakes and rivers?

Explanation:

Link:

Question (34)

A water sample contains 16 mg/L dissolved oxygen. Another contains 12 mg/L. Which sample is likely to support aquatic life better?

Explanation:

Link:

Question (35)

Which pair correctly matches the gas and its common role?

Explanation:

Link:

Question (36)

Dissolved oxygen decreases from 15 mg/L to 12 mg/L after warming. What percentage decrease occurred?

Explanation:

Link:

Question (37)

Which condition would contain the least dissolved oxygen?

Explanation:

Link:

Question (38)

A carbonated drink contains 28 units of dissolved CO₂. If 25% escapes after opening, how many units remain dissolved?

Explanation:

Link:

Question (39)

A scientist compares two containers. Container A has 18 units of dissolved gas at high pressure. Container B has 12 units at low pressure. How much more gas is dissolved in A?

Explanation:

Link:

Question (40)

Which real-life example best demonstrates the effect of pressure on gas solubility?

Explanation:

Link:

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