Q7. A real gas within a closed chamber at $27 ^ { \circ } \mathrm { C }$ undergoes the cyclic process as shown in figure. The gas obeys $P V ^ { 3 } = R T$ equation for the path $A$ to $B$. The net work done in the complete cycle is (assuming $R = 8 \mathrm {~J} / \mathrm { molK }$\\
\includegraphics[max width=\textwidth, alt={}, center]{694a919f-a664-4e77-a59a-c8889b2816c1-02_407_551_267_251}\\
):\\
(1) 20 J\\
(2) 205 J\\
(3) - 20 J\\
(4) 225 J