6. a metal forms two oxides, a and b. 1 g of a on reduction gave 0.881 g of
metal, while 1 g of b yielded 0.788 g of metal. show that these facts are in
agreement with the law of multiple proportions.
010

Here's what I get.

Explanation:

The Law of Multiple Proportions states that when two elements A and B combine to form two or more compounds, the masses of B that combine with a given mass of A are in the ratios of small whole numbers.

That is, if one compound has a ratio r₁ and the other has a ratio r₂, the ratio of the ratios r is in small whole numbers.

1. Oxide A

Mass of O = 1 - 0.881 = 0.119 g

2. Oxide B

Mass of O = 1 - 0.788 = 0.212 g

3. Ratio of the ratios