# Gases and Gas Laws MCQs with Answers

Which gas law states that the pressure of a gas is inversely proportional to its volume, assuming constant temperature and amount of gas?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

According to Charles’s law, the volume of a gas is directly proportional to its:

a) temperature

b) pressure

c) amount of gas

d) molar mass

**Answer: **a) temperature

At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles present. This statement is known as:

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **c) Avogadro’s law

The ideal gas law can be written as:

a) PV = nRT

b) PV = RT

c) V = nRT

d) P = nRT

**Answer: **a) PV = nRT

The pressure of a gas is directly proportional to its temperature, assuming constant volume and amount of gas. This statement represents:

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **d) Gay-Lussac’s law

Which gas law describes the relationship between the pressure and volume of a gas, assuming constant temperature and number of moles?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

According to the kinetic molecular theory of gases, gas particles:

a) have definite shapes and volumes

b) are tightly packed together

c) are in constant motion

d) have strong intermolecular forces

**Answer: **c) are in constant motion

The volume of a given amount of gas is inversely proportional to its pressure, assuming constant temperature. This relationship is described by:

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

The combined gas law combines which three gas laws into a single equation?

a) Boyle’s, Charles’s, and Avogadro’s laws

b) Boyle’s, Charles’s, and Gay-Lussac’s laws

c) Boyle’s, Avogadro’s, and Gay-Lussac’s laws

d) Charles’s, Avogadro’s, and Gay-Lussac’s laws

**Answer: **b) Boyle’s, Charles’s, and Gay-Lussac’s laws

According to the ideal gas law, which variable is directly proportional to the temperature of a gas?

a) pressure

b) volume

c) amount of gas

d) all of the above

**Answer: **d) all of the above

The ideal gas law assumes that gas particles:

a) have no volume

b) have no mass

c) do not interact with each other

d) have high intermolecular forces

**Answer: **c) do not interact with each other

A sample of gas has a volume of 2.0 L at 1.0 atm and 273 K. What will be the new volume if the pressure is increased to 2.0 atm and the temperature remains constant?

a) 1.0 L

b) 2.0 L

c) 4.0 L

d) 8.0 L

**Answer: **a) 1.0 L

According to Boyle’s law, if the volume of a gas decreases, what happens to the pressure, assuming constant temperature?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **a) increases

At constant temperature, the pressure of a gas is doubled. What happens to its volume, assuming no change in the amount of gas?

a) It is halved

b) It is doubled

c) It remains constant

d) It cannot be determined

**Answer: **a) It is halved

A gas sample occupies a volume of 5.0 L at a pressure of 2.0 atm. If the pressure is increased to 4.0 atm while keeping the temperature constant, what will be the new volume?

a) 2.5 L

b) 5.0 L

c) 10.0 L

d) 20.0 L

**Answer: **a) 2.5 L

According to Charles’s law, if the temperature of a gas decreases, what happens to its volume, assuming constant pressure?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **b) decreases

A sample of gas occupies a volume of 5.0 L at 273 K. If the temperature is increased to 546 K while keeping the pressure constant, what will be the new volume?

a) 2.5 L

b) 5.0 L

c) 10.0 L

d) 20.0 L

**Answer: **c) 10.0 L

The ideal gas law is based on which fundamental gas law?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **c) Avogadro’s law

The pressure of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) kilogram (kg)

d) Kelvin (K)

**Answer: **b) atmosphere (atm)

The volume of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) liter (L)

d) Kelvin (K)

**Answer: **c) liter (L)

The temperature of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) liter (L)

d) Kelvin (K)

**Answer: **d) Kelvin (K)

The number of moles of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) liter (L)

d) mole (mol)

**Answer: **d) mole (mol)

The ideal gas constant (R) has the same value for all gases when the units are in:

a) pascal (Pa) and liter (L)

b) atmosphere (atm) and liter (L)

c) kilogram (kg) and second (s)

d) Kelvin (K) and mole (mol)

**Answer: **b) atmosphere (atm) and liter (L)

Which gas law is also known as the law of combining volumes?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **c) Avogadro’s law

The ideal gas law can be used to calculate the value of which variable, assuming the values of the other three variables are known?

a) pressure

b) volume

c) temperature

d) amount of gas

**Answer: **c) temperature

The relationship between the pressure and volume of a gas, assuming constant temperature and number of moles, is described by which gas law?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

According to the ideal gas law, what happens to the pressure of a gas if its volume is doubled, assuming constant temperature and amount of gas?

a) It is halved

b) It is doubled

c) It remains constant

d) It cannot be determined

**Answer: **a) It is halved

The volume of a given amount of gas is directly proportional to its temperature, assuming constant pressure. This relationship is described by:

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **b) Charles’s law

A sample of gas has a volume of 2.0 L at 1.0 atm and 273 K. What will be the new volume if the temperature is increased to 546 K and the pressure remains constant?

a) 1.0 L

b) 2.0 L

c) 4.0 L

d) 8.0 L

**Answer: **c) 4.0 L

According to Charles’s law, if the volume of a gas increases, what happens to the temperature, assuming constant pressure?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **a) increases

At constant pressure, the volume of a gas is tripled. What happens to its temperature, assuming no change in the amount of gas?

a) It is halved

b) It is doubled

c) It is tripled

d) It remains constant

**Answer: **d) It remains constant

A gas sample occupies a volume of 5.0 L at a temperature of 273 K. If the temperature is increased to 546 K while keeping the volume constant, what will be the new pressure?

a) 0.5 atm

b) 1.0 atm

c) 2.0 atm

d) 4.0 atm

**Answer: **c) 2.0 atm

The volume of a gas is directly proportional to the number of moles present, assuming constant temperature and pressure. This relationship is described by which gas law?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **c) Avogadro’s law

According to the ideal gas law, which variable is inversely proportional to the volume of a gas?

a) pressure

b) temperature

c) amount of gas

d) all of the above

**Answer: **a) pressure

The pressure of a gas is inversely proportional to its temperature, assuming constant volume and amount of gas. This statement represents which gas law?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **d) Gay-Lussac’s law

The combined gas law can be used to calculate the value of which variable, assuming the values of the other three variables are known?

a) pressure

b) volume

c) temperature

d) amount of gas

**Answer: **b) volume

A sample of gas has a volume of 2.0 L at 1.0 atm and 273 K. What will be the new pressure if the volume is increased to 4.0 L and the temperature remains constant?

a) 0.5 atm

b) 1.0 atm

c) 2.0 atm

d) 4.0 atm

**Answer: **a) 0.5 atm

According to Boyle’s law, if the pressure of a gas decreases, what happens to its volume, assuming constant temperature?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **a) increases

At constant temperature, the pressure of a gas is halved. What happens to its volume, assuming no change in the amount of gas?

a) It is halved

b) It is doubled

c) It remains constant

d) It cannot be determined

**Answer: **b) It is doubled

A gas sample occupies a volume of 5.0 L at a pressure of 2.0 atm. If the volume is increased to 10.0 L while keeping the pressure constant, what will be the new temperature?

a) 136.5 K

b) 273 K

c) 546 K

d) 1092 K

**Answer: **b) 273 K

According to Charles’s law, if the temperature of a gas increases, what happens to its volume, assuming constant pressure?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **a) increases

A sample of gas occupies a volume of 5.0 L at a temperature of 273 K. If the temperature is doubled while keeping the volume constant, what will be the new pressure?

a) 0.5 atm

b) 1.0 atm

c) 2.0 atm

d) 4.0 atm

**Answer: **c) 2.0 atm

The ideal gas law relates which four variables of a gas?

a) pressure, volume, temperature, and molar mass

b) pressure, volume, temperature, and number of moles

c) pressure, volume, temperature, and density

d) pressure, volume, temperature, and velocity

**Answer: **b) pressure, volume, temperature, and number of moles

The volume of a gas is inversely proportional to its pressure, assuming constant temperature and number of moles. This relationship is described by which gas law?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

According to the ideal gas law, which variable is directly proportional to the pressure of a gas?

a) volume

b) temperature

c) amount of gas

d) all of the above

**Answer: **a) volume

The pressure of a gas is directly proportional to its temperature, assuming constant volume and amount of gas. This statement represents which gas law?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **d) Gay-Lussac’s law

The volume of a given amount of gas is directly proportional to its pressure, assuming constant temperature. This relationship is described by which gas law?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

The combined gas law combines which three gas laws into a single equation?

a) Boyle’s, Charles’s, and Avogadro’s laws

b) Boyle’s, Charles’s, and Gay-Lussac’s laws

c) Boyle’s, Avogadro’s, and Gay-Lussac’s laws

d) Charles’s, Avogadro’s, and Gay-Lussac’s laws

**Answer: **b) Boyle’s, Charles’s, and Gay-Lussac’s laws

According to the ideal gas law, which variable is directly proportional to the temperature of a gas?

a) pressure

b) volume

c) amount of gas

d) all of the above

**Answer: **d) all of the above

The ideal gas law assumes that gas particles:

a) have no volume

b) have no mass

c) do not interact with each other

d) have high intermolecular forces

**Answer: **c) do not interact with each other

A sample of gas has a volume of 2.0 L at 1.0 atm and 273 K. What will be the new volume if the pressure is increased to 2.0 atm and the temperature remains constant?

a) 1.0 L

b) 2.0 L

c) 4.0 L

d) 8.0 L

**Answer: **a) 1.0 L

According to Boyle’s law, if the volume of a gas decreases, what happens to the pressure, assuming constant temperature?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **a) increases

At constant temperature, the pressure of a gas is doubled. What happens to its volume, assuming no change in the amount of gas?

a) It is halved

b) It is doubled

c) It remains constant

d) It cannot be determined

**Answer: **a) It is halved

A gas sample occupies a volume of 5.0 L at a pressure of 2.0 atm. If the pressure is increased to 4.0 atm while keeping the temperature constant, what will be the new volume?

a) 2.5 L

b) 5.0 L

c) 10.0 L

d) 20.0 L

**Answer: **a) 2.5 L

According to Charles’s law, if the temperature of a gas decreases, what happens to its volume, assuming constant pressure?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **b) decreases

A sample of gas occupies a volume of 5.0 L at 273 K. If the temperature is increased to 546 K while keeping the pressure constant, what will be the new volume?

a) 2.5 L

b) 5.0 L

c) 10.0 L

d) 20.0 L

**Answer: **c) 10.0 L

The ideal gas law is based on which fundamental gas law?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **c) Avogadro’s law

The pressure of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) kilogram (kg)

d) Kelvin (K)

**Answer: **b) atmosphere (atm)

The volume of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) liter (L)

d) Kelvin (K)

**Answer: **c) liter (L)

The temperature of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) liter (L)

d) Kelvin (K)

**Answer: **d) Kelvin (K)

The number of moles of a gas is measured in which unit?

a) pascal (Pa)

b) atmosphere (atm)

c) liter (L)

d) mole (mol)

**Answer: **d) mole (mol)

The ideal gas constant (R) has the same value for all gases when the units are in:

a) pascal (Pa) and liter (L)

b) atmosphere (atm) and liter (L)

c) kilogram (kg) and second (s)

d) Kelvin (K) and mole (mol)

**Answer: **b) atmosphere (atm) and liter (L)

Which gas law is also known as the law of combining volumes?

a) Boyle’s law

b) Charles’s law

c) Avogadro’s law

d) Gay-Lussac’s law

**Answer: **c) Avogadro’s law

The ideal gas law can be used to calculate the value of which variable, assuming the values of the other three variables are known?

a) pressure

b) volume

c) temperature

d) amount of gas

**Answer: **c) temperature

The relationship between the pressure and volume of a gas, assuming constant temperature and number of moles, is described by which gas law?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **a) Boyle’s law

According to the ideal gas law, what happens to the pressure of a gas if its volume is doubled, assuming constant temperature and amount of gas?

a) It is halved

b) It is doubled

c) It remains constant

d) It cannot be determined

**Answer: **a) It is halved

The volume of a given amount of gas is directly proportional to its temperature, assuming constant pressure. This relationship is described by which gas law?

a) Boyle’s law

b) Charles’s law

c) Gay-Lussac’s law

d) Avogadro’s law

**Answer: **b) Charles’s law

A sample of gas has a volume of 2.0 L at 1.0 atm and 273 K. What will be the new volume if the temperature is increased to 546 K and the pressure remains constant?

a) 1.0 L

b) 2.0 L

c) 4.0 L

d) 8.0 L

**Answer: **c) 4.0 L

According to Charles’s law, if the volume of a gas increases, what happens to the temperature, assuming constant pressure?

a) increases

b) decreases

c) remains constant

d) cannot be determined

**Answer: **a) increases

A sample of gas occupies a volume of 5.0 L at a temperature of 273 K. If the temperature is increased to 546 K while keeping the volume constant, what will be the new pressure?

a) 2.5 atm

b) 5.0 atm

c) 10.0 atm

d) 20.0 atm