The expansion of gas having no opposing force is called as

An ideal gas is allowed to expand from $2 \ dm^3$ to $6 \times 10^{-3} \ m^3$ against a constant external pressure of $1 \ bar$. The work done in $kJ$ is (in $kJ$)

What is the constant external pressure of an ideal gas when expanded from $2 \times 10^{-2} \ m^3$ to $3 \times 10^{-2} \ m^3$,if the work done by the gas is $-5.09 \ kJ$?

Identify the correct equation relating enthalpy $(H)$ and internal energy $(E)$.

Prove the relationship between $C_p$ and $C_v$ for an ideal gas.

Which of the following statements is not correct?