At `27^@` C, a closed vessel contains a mixture of equal weights of helium (mol. wt. = 4 ), methane (mol. wt. =16) and sulphur dioxide (mol. wt = 64). The pressure exerted by the mixture is 210 mm. If the partial pressures of helium, methane and sulphur dioxide are `P_(1)`, `P_(2)` and `P_(3)` respectively, which one of the following is correct ?

Options

A. `P_(3) gt P_(2) gt P_(1)`
B. `P_(1) gt P_(2) gt P_(3)`
C. `P_(1) gt P_(3) gt P_(2)`
D. `P_(2) gt P_(3) gt P_(1)`

Answer

b

Explanation

Consider the weight of each gas as 64g.
`therefore` It is concluded that `P_(1) gt P_(2) gt P_(3)`