Temperature of 5 moles of a gas is decreased by 2K at constant pressure. Indicate the correct statement 

For5 moles of gas at temperature T, 
${\mathrm{PV}}_1=5\mathrm{RT}$
For 5 moles of gas at temperature T — 2, 
$$\begin{gathered} {\text{PV}}_2=5\mathrm{R}(\mathrm{T}-2) \\ \therefore \mathrm{P}\left({\mathrm{V}}_2-{\mathrm{V}}_1\right)=5\mathrm{R}(\mathrm{T}-2-\mathrm{T}) \\ \mathrm{P\Delta V}=-10\mathrm{R} \\ -\mathrm{P\Delta V}=10\mathrm{R} \\ \mathrm{When} \mathrm{\Delta V} \mathrm{isnegative}, \mathrm{W} \mathrm{is} + \mathrm{ve}. \end{gathered}$$