Question

on being heated in oxygen 5.72 g of red metallic oxide A was converted to 6.36 gram black metallic oxide B When 4.77 g of B was heated in a stream of H2 gas, 3.81g of metal M was formed ( Given, atomic weight of metal is 63.50)... 1)the formula of red metallic oxide A is (1) MO (2)MO2 (3) M2O (4) M2O3. With explanation ​

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