Which of the following is equal to $[{\partial P/\partial V}]_T$ for an ideal gas?

$1 \ L$ closed flask contains a mixture of $4 \ g$ of methane and $4.4 \ g$ of carbon dioxide. The pressure inside the flask at $27^{\circ} C$ is [Assume ideal behaviour of gases] (in $atm$)

Which of the following graphs is correct for an ideal gas?

At what temperature will the volume of a gas be halved if the initial temperature is $17^{\circ}C$ and the pressure remains constant (in $^{\circ}C$)?

If the volume of $N_2$ gas at $STP$ is $204.75 \, mL$,then calculate the volume of the gas at $1.5 \, bar$ pressure and $127 \, ^oC$ temperature.

$4.4 \ g$ of a gas at $0^{\circ} C$ and $0.82 \ atm$ pressure occupies a volume of $2.73 \ L$. The gas can be: