Gas Laws And Mole Concept — Practice Quiz
Kerala Board · Class 10 · Chemistry
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Quick Quiz: Gas Laws And Mole Concept
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According to Boyle's law, at constant temperature, the volume of a fixed mass of gas is:
What is the value of Avogadro's number?
At STP, one mole of any gas occupies a volume of:
The molecular mass of CO₂ is: (Given: C = 12, O = 16)
Sample Questions
Which of the following statements about Charles's law are correct?
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Volume is directly proportional to temperature in Kelvin, V/T = constant at constant pressure, All gases have zero volume at -273°C
Charles's law relates volume and temperature at constant pressure. V ∝ T (Kelvin), and all gas-temperature graphs extrapolate to zero volume at absolute zero (-273°C).
Which of the following are postulates of kinetic molecular theory?
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Gas molecules are in constant random motion, Attractive forces between gas molecules are negligible, Collisions between gas molecules are elastic, Average kinetic energy is proportional to temperature
Kinetic molecular theory describes gases as having particles in constant motion, negligible intermolecular forces, elastic collisions, and kinetic energy proportional to temperature.
If the volume of a gas is 200 mL at 300 K, what will be its volume at 400 K (pressure constant)?
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266.7 mL
Using Charles's law: V₁/T₁ = V₂/T₂. So, 200/300 = V₂/400. Therefore, V₂ = (200 × 400)/300 = 266.7 mL
How many moles are present in 88 g of CO₂? (Molecular mass of CO₂ = 44)
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2 moles
Number of moles = Given mass/Molar mass = 88/44 = 2 moles
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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