A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is

Options

A. `1 : 4`
B. `1 : 8`
C. `7 : 32`
D. `3 : 16`

Answer

C

Explanation

Mol. Ratio `O_(2):N_(2)`
`(1)/(32) : (4)/(28)`
Molecules `(N_(A))/(32) : (4N_(A))/(28) implies 7:32`