Assertion: In a container containing gas `'A'` at temperature `400 K`, some more gas `A` at temperature `300 K` is introduced. The pressure of the system increases.
Reason: Increase in gaseous particle increses the number of collisions among the molecules.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

B

Explanation

Pressure increases due to increase in number of moles in fixed volume. This is because number of collision per unit volume increases.