Question
Why is Nickel-cadmium cell referred to as a secondary cell?
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| $[ A ]_0 / M$ | $[ B ]_0 / M$ | $r _0 / Ms ^{-1}$ |
| $0.488$ | $0.160$ | $0.24$ |
| $0.244$ | $0.160$ | $0.06$ |
| $0.244$ | $0.320$ | $0.12$ |
| Bond enthalpies | $H - H$ | $C - H$ | $C - C$ |
| $\Delta H ^0 kJ mol ^{-1}$ | $436.4$ | 414 | 350 |