Gay Lussac discovered gas laws for measuring the properties of gases along with Charles and Boyle. Gay-Lussac’s law tells about the relationship between pressure and temperature of a gas. It talks about the pressure-temperature relationship of the gas. According to Gay-Lussac’s law, the pressure of a fixed amount of gas, at constant volume, is directly proportional to the temperature. We can see in our daily lives that the pressure of a tyre increases during summers and needs to be adjusted to avoid bursting, whereas, in winters, the pressure decreases considerably.

1. In a closed flask of 5 litres, 1.0 g of H₂ is heated from 300 to 600 K. Which of the following statement is incorrect?

(a) The rate of collision increases

(b) Pressure of the gas increases

(c) The energy of gaseous molecules increases

(d) The number of moles of gas increases

2. For an ideal gas, the density is equal to _______.

(a) P/RT

(b) RT/PM

(c) PM/RT

(d) M/V

3. Which of the following is correct for a fixed amount of ideal gas at constant temperature?

(a) Volume always remains constant

(b) The ratio of pressure and volume always remains constant

(c) The product of pressure and volume always remains constant

(d) Pressure always remains constant

4. When does a real gas start to behave like an ideal gas?

(a) At high temperatures and high pressures

(b) At low temperatures and high pressures

(c) At high temperatures and low pressures

(d) At low temperatures and low pressures

5. According to Gay-Lussac’s law for an ideal gas, the absolute pressure of a fixed amount of gas varies directly as ________.

(a) absolute temperature, if the volume is kept constant

(b) remains constant, if volume and temperature are kept constant

(c) absolute temperature

(d) volume, if the temperature is kept constant

6. The temperature of a given mass of a gas, at pressure P and volume V is 27°C. Find its pressure if its temperature is raised to 927°C, at constant volume.

(a) 6P

(b) 4P

(c) 3P

(d) 2P

7. What would be the pressure of a closed gaseous system, when the temperature is doubled?

(a) Doubled

(b) Halved

(c) Quadrupled

(d) Remains the same

8. If the pressure of a certain amount of gas is increased by 2 times, at a fixed temperature, then its final volume will become ________.

(a) One half

(b) Double

(c) One fourth

(d) Triple

9. What would be the percentage increase in the pressure of a gas contained in a closed vessel, at the temperature of 250 K, if the gas is heated by 1 K?

(a) 0.6%

(b) 1%

(c) 0.8%

(d) 0.4%

10. Which of the following gas laws is applicable for an ideal gas?

(a) Charles’law

(b) Boyle’s law

(c) Gay-Lussac’s law

(d) All of the above

Answer