The rate of diffusion of two gases X and Y is in the ration of `1:5` and that of Y and Z in the ratio of `1:6`. The ratio of the rate of diffusion of Z with respecte to X is `:`

The rate of diffusion of two gases A and B is in the ratio of 1 : 4 and that of B and C in the ratio of 1 : 3 . The rate of diffusion of C with respect to A is

The rates of diffusion of hydrogen and deuterium are in the ratio:

The densities of two gases are in the ratio of 1 : 16 . The ratio of their rates of diffusion is

The rates of diffusion of two gases A and B are in the the ratio 1:4 A mixture contains these gases A and B in the ration 2:3 The ration of mole fraction of the gases A and B in the mixture is (assume that P_(A) =P_(B)) .

If the ratio of the rates of diffusion of two gases A and B is 4:1 the ratio of their density is