Based on the kinetic theory of gases, the number of collisions will increases when voulme decreases and pressure is also increases when volume decreases.
What is the realation between pressure & temperature?
Relation between the pressure and temperature of the gas will be represented by using the ideal gas equation as:
PV = nRT or
P ∝ 1/V
From the relation it is clear that pressure is inversely proportional to the volume of the gases. In the question it is mentioned that volume decreases from 2L to 1L as a result of which pressure increases in the 1L of gas. As space for the gases molecules decraeses so that number of collisions in the 1L of gas increases.
Hence pressure and collision of gas increases.
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