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Which among the following statements is/are correct?
(a) If \( \mathrm{E}_{\mathrm{A}^{\mathrm{n}} / \mathrm{A}}^{0} \) is negative, \( \mathrm{H}^{+} \)will be reduced to \( \mathrm{H}_{2} \) by the element A.
(b) Compounds of ( \( \mathrm{Zn}, \mathrm{Na}, \mathrm{Mg}) \) are reduced by hydrogen \( \left(\mathrm{H}_{2}\right) \) whereas those of noble metals \( (\mathrm{Cu}, \mathrm{Ag}, \mathrm{Au}) \) are not reducible.
(c) If \( \mathrm{E}_{\mathrm{A}^{\mathrm{n}+} / \mathrm{A}}^{0} \) is positive, \( \mathrm{A}^{\mathrm{n}+} \) will be reduced to \( \mathrm{A} \) by \( \mathrm{H}_{2} \).
(d) \( \mathrm{M}\left|\mathrm{M}^{\mathrm{n}+} \| \mathrm{H}^{+}\right| \mathrm{H}_{2}(\mathrm{Pt}) \) will be spontaneous if \( \mathrm{E}_{\mathrm{M}^{n+} / \mathrm{M}}^{0} \) is negative.
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