A metal forms two oxides. The higher oxi...

A metal forms two oxides. The higher oxide contains 80% metal. `0.72 g` of the lower oxide gave `0.8 g` of higher oxide when oxidised. Calculate the ratio of weight of oxygen that combines with the fixed weight of metal in the two oxides, and show that the data supports the law of multiple proportions.

`2 : 3`

`1 : 2`

`4 : 5`

`3 : 2`

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