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Question

Two oxides of a certain metal were separately heated in hydrogen till water was produced. It was observed that 1 gm of each oxide gave 0.125 gm and 0.2263 gm of water respectively. This illustrates the law of:

A
definite proportions
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B
multiple proportions
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C
reciprocal proportions
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D
conservation of mass
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Solution

The correct option is B multiple proportions
The law of multiple proportions says that If two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
Therefore, the ratio of the weights of oxygen which react with a fixed mass of the metal is 0.1250.2263 which is approx 1:2.

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