The ratio of rates of diffusion of gases X and Y is 1 : 5 and that of Y and Z is 1 : 6. Then ratio of rates of diffusion Z and X is

Options

A. `1:30`
B. `1 :6`
C. `30:1`
D. `6 : 1`

Answer

c

Explanation

`r_(x)/r_(y)=1/5 ….(1)`
`r_(y)/r_(z)=1/6` ….(1)
Multiplying equations (1) and (2),`r_(x)/r_(z)=1/30`
`therefore r_(z):r_(x)=30:1`