Which of the following is a merit of \( \mathrm{Ni}-\mathrm{Cd} \) cell over lead storage batter...

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Which of the following is a merit of \( \mathrm{Ni}-\mathrm{Cd} \) cell over lead storage battery?
(a) \( \mathrm{Ni}-\mathrm{Cd} \) cell can be re-used.
(b) \( \mathrm{Ni}-\mathrm{Cd} \) cell is comparatively economical to manufacture
(c) \( \mathrm{Ni}-\mathrm{Cd} \) cell has comparatively longer life
(d) All the above are the merits of \( \mathrm{Ni}-\mathrm{Cd} \) cell over lead storage battery.
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