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The e.m.f. of the following galvanic cells :
(a) \( \mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 M) \| \mathrm{Cu}^{2+}(1 M)\right| \mathrm{Cu} \)
(b) \( \mathrm{Zn}\left|\mathrm{Zn}^{2+}(0.1 M) \| \mathrm{Cu}^{2+}(1 M)\right| \mathrm{Cu} \)
(c) \( \mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 M) \| \mathrm{Cu}^{2+}(0.1 M)\right| \mathrm{Cu} \)
(d) \( \mathrm{Zn}\left|\mathrm{Zn}^{2+}(0.1 M) \| \mathrm{Cu}^{2+}(0.1 M)\right| \mathrm{Cu} \)
are represented by \( E_{1}, E_{2}, E_{3} \) and \( E_{4} \) respectively. Which of the following statement is true?
(a) \( E_{1}E_{2}E_{3}E_{4} \)
(b) \( E_{3}E_{2}E_{1}E_{4} \)
(c) \( E_{3}E_{1}=E_{4}E_{2} \)
(d) \( E_{2}E_{1}=E_{4}E_{3} \)
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