Gas Laws

IMPORTANT

Gas Laws: Overview

This Topic covers sub-topics such as Boyle's Law, Charles' Law, Avogadro's Law, Gay-Lussac's Law, Standard Temperature and Pressure, Absolute Zero Temperature, Gas Laws, Isobar in Graph, Isochore in Graph and, Graphs Based on Charles' Law

Important Questions on Gas Laws

MEDIUM
IMPORTANT

Arrange the following relevant points in a proper sequence for explaining why Kelvin scale is preferred to Celsius scale in the study of gases.

  1. -273°C is the least possible temperature.
  2. A graph of volume vs temperature is a straight line passing through origin.
  3. A graph of volume vs temperature 0°C is a straight line which intersects volume axis at some point.
  4. Extrapolation of straight line touches the volume axis at-273°C.
  5. -273°C is called absolute zero or 0 K.
  6. All values of temperature are positive in Kelvin scale.
  7. Usage of negative values for temperature gives negative values for other properties like pressure and volume.

MEDIUM
IMPORTANT

If the volume occupied by a certain mass of gas is decreased by 60%, what would be the percentage change in pressure at the same temperature?

EASY
IMPORTANT

At what centigrade temperature, will the volume of a given mass of a gas at 0°C triple itself if pressure is kept constant?

MEDIUM
IMPORTANT

Three gas cylinders of equal capacity are filled with oxygen and two unknown gases X and Y respectively at the same temperature and pressure. Calculate the gram molecular masses of X and Y if the mass of oxygen in the cylinder is 8 g and X and Y are 5 g and 20 g respectively.

MEDIUM
IMPORTANT

At certain amount of a gas is filled in a tank of volume 63000 L and 42 atm. If this gas is transferred to a cylinder of volume of 1260 L, find the number of cylinders that can be filled with the given gas at STP? (assume complete evacuation of the cylinder)

MEDIUM
IMPORTANT

Why is temperature in Kelvin scale always positive? Also explain why Kelvin temperature is used only in studying gas laws.

EASY
IMPORTANT

At constant temperature, a gas is at a pressure of 940 mm of Hg. At what pressure, its volume decreases by 40%?

MEDIUM
IMPORTANT

For which of the following reactions, is Gay-Lussac's law is not applicable?

MEDIUM
IMPORTANT

State Gay-Lussac's law of combining volumes of gases. Give an example. 

MEDIUM
IMPORTANT

What is STP? Give the values of temperature and pressure at STP. 

EASY
IMPORTANT

Which of the following graphs is true for the given mass a gas at constant temperature?

EASY
IMPORTANT

At constant temperature, when the volume of a gas is reduced to 1/3rd, the pressure will increase _____.

EASY
IMPORTANT

Which of the following graphs is true for a given mass of a gas at constant pressure?

EASY
IMPORTANT

Which of the following graphs is true for the given mass a gas at constant temperature?

EASY
IMPORTANT

Charle's law states that the rate of diffusion of a gas is inversely proportional to the square root of its density at constant temperature and pressure.

EASY
IMPORTANT

Avogadro's law states that under similar conditions of temperature and pressure, equal volumes of all gases contain equal number of molecules.

EASY
IMPORTANT

Boyle's law state that, for a given mass of a gas, the volume of a gas (V) is directly proportional to the absolute temperature (T) at constant pressure.

EASY
IMPORTANT

Real gases obey gas law under all conditions.

EASY
IMPORTANT

The volume of 32 g of oxygen at STP is 22.4 L.

EASY
IMPORTANT

Volume of the given mass of a gas is directly proportional to pressure at constant temperature.