Which substance is serving as a reducing agent in the following reaction

$14{\mathrm{H}}^{+}+{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}+3\mathrm{Ni}\to 2{\mathrm{Cr}}^{3+}+7{\mathrm{H}}_2\mathrm{O}+3{\mathrm{Ni}}^{2+}$

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