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

Gases | First Year Chemistry Past Paper MCQs

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1 The ideal gas constant R, when expressed in dm³ atm mol⁻¹ K⁻¹ units, has a value of:
Correct Answer: A
Explanation: The gas constant R = 0.0821 dm³ atm mol⁻¹ K⁻¹ for pressure in atmospheres.
2 Calorie is equivalent to:
Correct Answer: C
Explanation: 1 calorie = 4.184 joules (exact definition).
3 The density of a gas can be determined by the formula:
Correct Answer: A
Explanation: Derived from the ideal gas law (PV = nRT), where density (d) = mass/volume = (nM)/V = PM/RT.
4 Which gas has the highest diffusion rate?
Correct Answer: C
Explanation: NH₃ diffuses fastest due to its lower molar mass (17 g/mol) compared to others (Graham's law).
5 Mathematically, Boyle’s law is shown as:
Correct Answer: D
Explanation: Boyle’s law states PV = constant (K) at constant temperature.
6 Absolute zero is equal to:
Correct Answer: B
Explanation: Absolute zero = -273.15°C (or 0 K), the lowest possible temperature.
7 If the values of ‘a’ and ‘b’ in Van der Waal’s equation are close to zero for a gas, then the gas is:
Correct Answer: A
Explanation: Van der Waal’s corrections (a, b) account for non-ideality; near-zero values imply ideal behavior.
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