With an increase of pressure,the mean free path

Which of the following is correct about collision frequency $(Z_{11})$ of an ideal gas participating in an isobaric process?

The internal energy of one mole of an ideal gas is ............ .

$A$ bottle of ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be:

The kinetic energy of $1 \ mol$ of an ideal gas is given by:

Assuming ideal behaviour,the ratio of kinetic energies of $3 \ g$ of $H_2$ and $4 \ g$ of $O_2$ at any temperature is