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Which of the following facts is not true?
(a) If \( \mathrm{E}^{\mathrm{o}}\left(\mathrm{M}^{\mathrm{n}+} / \mathrm{M}\right) \) is negative, \( \mathrm{H}^{+} \)will be reduced to \( \mathrm{H}_{2} \) by the metal \( \mathrm{M} \)
(b) If \( \mathrm{E}^{\mathrm{o}}\left(\mathrm{M}^{\mathrm{n}} / \mathrm{M}\right) \) is positive, \( \mathrm{M}^{\mathrm{n}+} \) will be reduced to \( \mathrm{M} \) by \( \mathrm{H}_{2} \)
(c) In a cell, \( \mathrm{M}^{\mathrm{n+}} / \mathrm{M} \) electrode is attached to hydrogen half cell. To produce spontaneous cell reaction, metal \( \mathrm{M} \) generally acts as negative electrode
(d) Compound of active metals (Zn, Na, Mg) are reducible by \( \mathrm{H}_{2} \) whereas those of noble metals \( (\mathrm{Cu}, \mathrm{Ag}, \mathrm{Au}) \) are not reducible
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