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The temperature coefficient of e.m.f. of a cell can be given by:
(A) \( \left(\frac{\partial E}{\partial T}\right)_{P}=\frac{\Delta S}{n F} \)
(B) \( \left(\frac{\partial E}{\partial T}\right)_{P}=\left(\frac{E_{2}-E_{1}}{T_{2}-T_{1}}\right)_{P} \)
(C) \( \left(\frac{\partial E}{\partial T}\right)_{P}=\left[\frac{\Delta H}{n F}+E\right] \cdot \frac{1}{T} \)
(D) All of the above
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