Question

A mixture of gases $O_2,H_{2}andCO$ are taken in a closed vessel containing charcoal The graph that represents the correct behaviour of pressure with time is

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Initially $H_2$ combines with $O_2$, therefore rapid fall in pressure will be observed. then gradually adsorption of $CO$ will occur by activated charcoal.
As the adsorption increases, the pressure decreases.
With time pores of charcoal decrease.
So initial it will decrease fast but after some time its decrease rate will be slow.
Option (b) is correct