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Question (21)

QN0029113

Why do bubbles appear immediately after opening a soft drink bottle?

(A) Solubility increases
(B) Pressure decreases
(C) Temperature decreases
(D) Water freezes

Correct Answer: B

Explanation:

The drop in pressure causes dissolved gas to escape.

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Question (22)

QN0029114

Which liquid condition is most suitable for aquatic life?

(A) High dissolved oxygen
(B) No dissolved oxygen
(C) Very high temperature
(D) Boiling water

Correct Answer: A

Explanation:

Aquatic organisms need dissolved oxygen.

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Question (23)

QN0029115

A water sample contains 14 mg/L oxygen in winter and 9 mg/L in summer. By how much did dissolved oxygen decrease?

(A) 3 mg/L
(B) 4 mg/L
(C) 5 mg/L
(D) 6 mg/L

Correct Answer: C

Explanation:

14 − 9 = 5 mg/L.

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Question (24)

QN0029116

If a gas has a solubility of 20 units at high pressure and 12 units at low pressure, the increase due to pressure is:

(A) 6 units
(B) 7 units
(C) 8 units
(D) 9 units

Correct Answer: C

Explanation:

20 − 12 = 8 units.

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Question (25)

QN0029117

Which statement is correct regarding temperature and gas solubility?

(A) Increasing temperature generally decreases gas solubility
(B) Increasing temperature always increases gas solubility
(C) Temperature has no effect
(D) Solubility becomes zero at high temperature

Correct Answer: A

Explanation:

Gas solubility generally decreases with increasing temperature.

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Question (26)

QN0029118

A cold beverage contains 30 units of dissolved CO₂. After warming, it contains 21 units. What fraction of the original dissolved gas remains?

(A) 1/2
(B) 2/3
(C) 3/4
(D) 4/5

Correct Answer: B

Explanation:

21/30 = 2/3.

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Question (27)

QN0029119

Which gas is intentionally dissolved in soda water?

(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Hydrogen

Correct Answer: C

Explanation:

Soda water contains dissolved carbon dioxide.

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Question (28)

QN0029120

A tank contains water with dissolved oxygen concentration of 11 mg/L. If it drops to 7 mg/L due to heating, what is the decrease?

(A) 2 mg/L
(B) 3 mg/L
(C) 4 mg/L
(D) 5 mg/L

Correct Answer: C

Explanation:

11 − 7 = 4 mg/L.

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Question (29)

QN0029121

Which action would increase oxygen solubility in water?

(A) Heating the water
(B) Increasing pressure
(C) Boiling the water
(D) Keeping it in sunlight

Correct Answer: B

Explanation:

Increased pressure allows more gas to dissolve.

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Question (30)

QN0029122

A soft drink has 40 units of dissolved CO₂ before opening and 25 units after some time. What percentage escaped?

(A) 25%
(B) 37.5%
(C) 50%
(D) 62.5%

Correct Answer: B

Explanation:

(15/40) × 100 = 37.5%.

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Question (21)

Why do bubbles appear immediately after opening a soft drink bottle?

Explanation:

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Question (22)

Which liquid condition is most suitable for aquatic life?

Explanation:

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Question (23)

A water sample contains 14 mg/L oxygen in winter and 9 mg/L in summer. By how much did dissolved oxygen decrease?

Explanation:

Link:

Question (24)

If a gas has a solubility of 20 units at high pressure and 12 units at low pressure, the increase due to pressure is:

Explanation:

Link:

Question (25)

Which statement is correct regarding temperature and gas solubility?

Explanation:

Link:

Question (26)

A cold beverage contains 30 units of dissolved CO₂. After warming, it contains 21 units. What fraction of the original dissolved gas remains?

Explanation:

Link:

Question (27)

Which gas is intentionally dissolved in soda water?

Explanation:

Link:

Question (28)

A tank contains water with dissolved oxygen concentration of 11 mg/L. If it drops to 7 mg/L due to heating, what is the decrease?

Explanation:

Link:

Question (29)

Which action would increase oxygen solubility in water?

Explanation:

Link:

Question (30)

A soft drink has 40 units of dissolved CO₂ before opening and 25 units after some time. What percentage escaped?

Explanation:

Link:

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