Gases | First Year Chemistry Past Paper MCQs | mosaicbro.com

Gases | First Year Chemistry Past Paper MCQs

7 of 29 questions (Page 2 of 5)

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8 The constant factor in Charles’s law is:
Correct Answer: C
Explanation: Charles’s law (V ∝ T) assumes constant pressure.
9 Which gas will diffuse more rapidly?
Correct Answer: B
Explanation: NH₃ (17 g/mol) has the lowest molar mass among the options, favoring faster diffusion.
10 Normal human body temperature is:
Correct Answer: A
Explanation: Standard human body temperature = 37°C (98.6°F).
11 Partial pressure of oxygen in human lungs in torr is:
Correct Answer: C
Explanation: In alveoli, pO₂ ≈ 159 torr (21% of 760 torr total pressure).
12 The molar volume of CO₂ is maximum at:
Correct Answer: B
Explanation: Higher temperatures (127°C) increase molar volume (V ∝ T per Charles’s law).
13 The order of rate of diffusion of gases NH₃, SO₂, Cl₂, and CO₂ is:
Correct Answer: B
Explanation: NH₃ (17) > CO₂ (44) > SO₂ (64) > Cl₂ (71) — ordered by increasing molar mass.
14 Plasma is a conductor of electricity:
Correct Answer: C
Explanation: Plasma (ionized gas) conducts electricity due to free electrons and ions.
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