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

Gases | First Year Chemistry Past Paper MCQs

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15 To calculate the pressure and volume of a real gas under non-ideal conditions, the alternate kinetic equation used is:
Correct Answer: D
Explanation: Van der Waal’s equation corrects for non-ideal behavior: (P + a/V²)(V - b) = RT.
16 If the absolute temperature of a gas is doubled and pressure is reduced to one half, the volume of the gas will:
Correct Answer: B
Explanation: Combined gas law: V₂ = (P₁V₁T₂)/(P₂T₁) = (1×V₁×2T)/(0.5P×T) = 4V₁.
17 Pressure remaining constant, at which temperature will the volume of a gas become twice of what it is at 0°C?
Correct Answer: C
Explanation: Charles’s law: V ∝ T. To double volume, double temperature: 0°C = 273 K → 546 K.
18 One torr is equal to:
Correct Answer: C
Explanation: 1 torr = 1 mmHg (standard definition).
19 The S.I. unit of pressure is:
Correct Answer: C
Explanation: SI unit of pressure = Pascal (Pa) = Nm⁻².
20 The spreading of fragrance of scent in air is due to:
Correct Answer: B
Explanation: Diffusion is the movement of particles from high to low concentration (e.g., scent in air).
21 The value of R (in Nm K⁻¹ mol⁻¹) is:
Correct Answer: B
Explanation: R = 8.314 J K⁻¹ mol⁻¹ = 8.314 Nm K⁻¹ mol⁻¹ (since 1 J = 1 Nm).
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