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A metal oxide is reduced by heating it in a streamof hydrogen. It is found that after complete reduction, 3.15 g of the oxide have yielded 1.05g of the metal. We may deduce that:

(a) the atomic mass of the metal is 8

(b) the atomic mass of the metal is 4

(c) the equivalent mass of the metal is 4

(d) the equivalent mass of the metal is 8