Which of the following mixtures of gases at room temperature does not obey Dalton's law of partial pressure?

Which one of the following is the wrong statement about the liquid?

Equal masses of $H_{2(g)}$ and $He_{(g)}$ are enclosed in a container at constant temperature. The ratio of partial pressure of $H_2$ to $He$ is

What is the ratio of kinetic energies of $3 \ g$ of hydrogen and $4 \ g$ of oxygen at a certain temperature?

$20 \, L$ of $SO_2$ diffuses through a porous partition in $60 \, s$. Volume of $O_2$ diffused under similar conditions in $30 \, s$ will be ................ $L$. (in $.14$)

$A$ box of $1 \, L$ capacity is divided into two equal parts by a thin partition,which are filled with $2 \, g$ of $H_2$ and $16 \, g$ of $CH_4$ respectively. The temperature of each part is $T$. The pressure in each part is $P$. If the partition is removed,the total pressure will be: