Avogadro's Law is correctly represented by which of the following statements?

This question was previously asked in
RPF Constable 2024 Official Paper (Held On 03 Mar, 2025 Shift 1)
View all RPF Constable Papers >
  1. The volume of a gas is directly proportional to its temperature at constant pressure. 
  2. The pressure of a gas is directly proportional to its absolute temperature at constant volume. 
  3. Equal volumes of gases at the same temperature and pressure contain an equal number of molecules. 
  4. The total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases.

Answer (Detailed Solution Below)

Option 3 : Equal volumes of gases at the same temperature and pressure contain an equal number of molecules. 
Free
General Science for All Railway Exams Mock Test
2.1 Lakh Users
20 Questions 20 Marks 15 Mins

Detailed Solution

Download Solution PDF

The correct answer is Equal volumes of gases at the same temperature and pressure contain an equal number of molecules..

Key Points

  • Avogadro's Law states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.
  • This law helps explain the behavior of gases under different conditions, establishing a relationship between volume and the number of gas molecules.
  • It is mathematically expressed as V ∝ n (where V is volume and n is the number of moles of gas).
  • Avogadro's Law is fundamental to understanding ideal gas behavior and is used in deriving the Ideal Gas Law.

Additional Information

  • Ideal Gas Law
    • The Ideal Gas Law combines Avogadro's Law, Boyle's Law, and Charles's Law into one equation: PV = nRT.
    • Here, P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
    • This law assumes that gases behave ideally, meaning they have no intermolecular forces and occupy no volume.
  • Boyle's Law
    • Boyle's Law states that the pressure of a gas is inversely proportional to its volume when temperature and the number of moles are constant: P ∝ 1/V.
    • It explains how gas pressure increases when the volume decreases, provided the temperature remains unchanged.
  • Charles's Law
    • Charles's Law states that the volume of a gas is directly proportional to its temperature when pressure and the number of moles are constant: V ∝ T.
    • This law indicates that gas volume increases with an increase in temperature, provided pressure is constant.
  • Gas Constant (R)
    • The gas constant (R) is a proportionality constant in the Ideal Gas Law, with a value of 8.314 J/(mol·K).
    • R is essential for calculations involving the Ideal Gas Law, linking pressure, volume, temperature, and the number of moles.
Latest RPF Constable Updates

Last updated on Jun 2, 2025

-> The Railway Recruitment Board has released the RPF Constable 2025 Response Sheet on 24th March 2025. As per the official notice, the RPF Constable Answer Key will be available from 24th March 2025 to 29th March 2025. 

-> The RRB ALP 2025 Notification has been released on the official website. 

-> The Examination was held from 2nd March to 18th March 2025. Check the RPF Exam Analysis Live Updates Here.

-> RPF Constable 2025 application status was released in January 20, 2025.

Get Free Access Now
Hot Links: teen patti master old version teen patti gold new version 2024 all teen patti game teen patti bindaas