At a constant temperature and pressure,the ratio of the densities of two gases is $1 : 16$. The ratio of their rates of diffusion will be ........

$A$ container consists of a mixture of four gases: $5 \text{ g } H_2$,$8 \text{ g } He$,$50 \text{ g } CO_2$,and $20 \text{ g } Ne$ at a certain temperature. Which of the following gases exerts the minimum partial pressure?

$A$ person living in $Manali$ observed that cooking food without using a pressure cooker takes more time. The reason for this observation is that at high altitude:

Which of the following relationships is correct,where $r$ is the rate of diffusion of a gas and $d$ is its density?

At constant volume and temperature conditions,the rate of diffusion $D_A$ and $D_B$ of gases $A$ and $B$ having densities $\rho_A$ and $\rho_B$ are related by the expression:

The rate of diffusion of hydrogen is......