Question

When ideal gas is compressed isothermally, then its pressure
increases because

Molecular energy increases

Its potential energy increases

Its kinetic energy increases and molecule move apart

Number of collision per unit area with container walls increases​

Answer 1

Since in the given case it is said that we compress the volume; the volume of the gas decreases. We know that as the volume decreases, area also decreases. So, when the area decreases the number of collisions per unit area increases. This causes the increase in pressure.