Identify an example of an intensive property from the following:

Which of the following is an intensive property?

The expansion of gas having no opposing force is called as

Which one of the following is an extensive property?

The work done during reversible isothermal expansion of one mole of hydrogen gas at $25^{\circ}C$ from a pressure of $20 \ atm$ to $10 \ atm$ is
(Given $R = 2.0 \ cal \ K^{-1} \ mol^{-1}$)

$1.0 \ mol$ of a monoatomic ideal gas is expanded from state $(1)$ to state $(2)$ as shown in the figure. Calculate the work done for the expansion of the gas from state $(1)$ to state $(2)$ at $298 \ K$.