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Q21) A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is ... [ CBSE PMT 1989]


0.1596 g of Z2O3 reacts with 0.006 g of hydrogen
∴ 1 g of H2 reacts with 26.6 g of Z2O3
∴ Eq.Wt of Z2O3=Eq.Wt of Z + eq.wt of O
26.6=E + 8
At. wt=Equivalent wt × valency
At Wt of Z=18.6 × 3=55.8
Answer: (d)