question_answer

A vessel contains equal volumes of \[\text{S}{{\text{O}}_{\text{2}}}\]and \[\text{C}{{\text{H}}_{4}}.\]Through a small hole the gases effused into vacuum. After 200 seconds the total volume is reduced to half. What is the ratio of \[\text{S}{{\text{O}}_{\text{2}}}\]and \[\text{C}{{\text{H}}_{\text{4}}}\]remaining in the vessel?

A)  1:2                                        

B)  2:1

C)  1 :1                                       

D)  1:4