The emf of cell \(\rm {T1}\left|\underset{(0.001 {M})}{{T1}^{+}}\right|\left|\underset{(0.01 {M})}{{Cu}^{2+}}\right| {Cu}\) is 0.83 V at 298 K. It could be increased by :
1
increasing concentration of T1+ ions
2
increasing concentration of both T1+ and Cu2+ ions
3
decreasing concentration of both T1+ and Cu2+ ions
4
increasing concentration of Cu2+ ions