Formic acid is a stronger acid than Acetic Acid, why ?

In acetic acid, due to the +I effect of the alkyl group the electron density on the oxygen atom increases.

The release of H + ion becomes difficult. Thus , greater the magnitude of +I effect weaker will be the acid.

Order of +I effect : CH 3>H

Therefore , formic acid (HCOOH) is more acidic than acetic acid (CH 3COOH).

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.