When an ideal gas is compressed isothermally,its pressure:

For the $P-V$ diagram given for an ideal gas,which of the following correctly represents the $T-P$ diagram?

$Assertion :$ In an isothermal process,the whole of the heat supplied to the body is converted into internal energy.
$Reason :$ According to the first law of thermodynamics,$\Delta Q = \Delta U + P\Delta V$.

$A$ cylinder fitted with a piston contains $0.2 \, moles$ of air at a temperature of $27^{\circ}C$. The piston is pushed so slowly that the air within the cylinder remains in thermal equilibrium with the surroundings. Find the approximate work done by the system if the final volume is twice the initial volume (in $J$).

Which of the following is a slow process?

Obtain an expression for work done by an ideal gas in an isothermal expansion.