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Home/ Chemistry/NEET 2025 MCQ with Answer Explanation : “Ideal Gas Equation”.

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On: October 3, 2024 Posted in Chemistry, Education, Exam, NEET Comments: 0 Views: 587

NEET 2025 MCQ with Answer Explanation : “Ideal Gas Equation”.

  1. What is the effect of increasing the volume of a gas on its temperature if pressure is held constant?
    A) Temperature increases
    B) Temperature decreases
    C) Temperature remains constant
    D) Temperature fluctuates

Answer: B) Temperature decreases

Explanation: If the volume increases at constant pressure, the temperature must decrease according to Charles’s Law.

  1. The Ideal Gas Law can be derived from which two laws?
    A) Boyle’s and Avogadro’s Laws
    B) Boyle’s and Charles’s Laws
    C) Charles’s and Gay-Lussac’s Laws
    D) All of the above

Answer: D) All of the above

Explanation: The Ideal Gas Law can be derived from combining Boyle’s Law, Charles’s Law, and Avogadro’s Law.

  1. At what conditions do gases most deviate from ideal behavior?
    A) High temperature, low pressure
    B) Low temperature, high pressure
    C) High pressure, high temperature
    D) Low temperature, low volume

Answer: B) Low temperature, high pressure

Explanation: Under these conditions, the effects of intermolecular forces and particle volume become significant, causing deviations from ideal behavior.

  1. In an ideal gas, the root-mean-square speed of gas molecules is dependent on which of the following?
    A) Temperature and molar mass
    B) Pressure and volume
    C) Volume and temperature
    D) Molar mass and pressure

Answer: A) Temperature and molar mass

  1. What is the principle behind using the Ideal Gas Equation to calculate the density of a gas?
    A) Density is related to molar mass and volume.
    B) Pressure and temperature are irrelevant.
    C) Density can be measured at STP only.
    D) Density is the same for all gases.

Answer: A) Density is related to molar mass and volume.

  1. Which of the following represents the molar volume of an ideal gas at STP?
    A) 12.2 L
    B) 22.4 L
    C) 32.4 L
    D) 1.0 L

Answer: B) 22.4 L

Explanation: At STP, one mole of an ideal gas occupies a volume of 22.4 liters.

  1. If the pressure of a gas is increased while the temperature remains constant, what happens to the volume?
    A) It increases
    B) It remains the same
    C) It decreases
    D) It fluctuates

Answer: C) It decreases

Explanation: According to Boyle’s Law, pressure and volume are inversely related at constant temperature.

  1. What does it mean if a gas has a negative compressibility factor?
    A) The gas behaves ideally.
    B) The gas is more compressible than an ideal gas.
    C) The gas has negligible intermolecular forces.
    D) The gas cannot exist in its current state.

Answer: B) The gas is more compressible than an ideal gas.

Explanation: A negative compressibility factor indicates significant attractive forces between gas molecules.

  1. Which of the following is a correct unit for pressure?
    A) Joules
    B) Atmospheres
    C) Moles
    D) Liters

Answer: B) Atmospheres

Explanation: Pressure can be measured in various units, including atmospheres (atm), pascals (Pa), and torr.

  1. At constant temperature, what will happen to the number of moles of a gas if the pressure is increased and the volume is held constant?
    A) The number of moles will decrease.
    B) The number of moles will increase.
    C) The number of moles will remain constant.
    D) The number of moles will fluctuate.

Answer: A) The number of moles will decrease.

Explanation: According to the Ideal Gas Law, if pressure increases while volume remains constant, the number of moles must decrease to maintain the equation.

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