Gas Laws And Mole Concept — Important Questions
Kerala Board · Class 10 · Chemistry
42 important questions from Gas Laws And Mole Concept for Kerala Board Class 10 Chemistry, with answers. Written for the board exams 2027.
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Important Questions from Gas Laws And Mole Concept
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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