Question

In a closed flask of 5 L, 1.0 g of $H_2$ is heated from 300 to 600 K. Which statement is not correct?

• A. Pressure of the gas increases
• B. The rate of collision increases
• C. The number of moles of gas increases
• D. The energy of gaseous molecules increases

Answer 1

Answer: (C)

The number of moles of gas increases

Answer 2

The correct option is(C): The number of moles of gas increases.

Here, volume is constant and mass of hydrogen gas is also fixed, therefore the number of moles remains same. Now as the temperature increases, then pressure also increases. This will lead to more collisions among the gaseous molecules and hence, the energy of molecules increases.