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For each of the following balanced oxidation–reduction
reactions, (i) identify the oxidation numbers for all the elements in the reactants and products and (ii) state the total
number of electrons transferred in each reaction.
(b) 2 Hg2+1aq2 + N2H41aq2 ¡ 2 Hg1l2 + N21g2 + 4 H+1aq2