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Octet Rule

Elements X an...

Question

Elements X and Y are from two different compounds. In the first, $0.324$ g of X is combined with $0.471$ g of Y. In second, $0.117$ g of X is combined with $0.509$ g of Y. State the law illustrated by these chemical combinations.

Law of constant proportion

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Law of multiple proportion

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Law of reciprocal proportion

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None of these

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Solution

The correct option is B Law of multiple proportion
According to the law of multiple proportions, "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".
In the first compound, 0.324 g of X is combined with 0.471 g of Y.
Hence, 1 g of X is combined with $\frac{0.471}{0.324} = 1.45$ g of Y.
In the second compound, 0.117 g of X is combined with 0.509 g of Y.
Hence, 1 g of X is combined with $\frac{0.509}{0.117} = 4.35$ g of Y.
The ratio $\frac{4.35}{1.45} = \frac{3}{1}$ is a small whole number.

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Elements X and Y are from two different compounds. In the first, 0.324 g of X is combined with 0.471 g of Y. In second, 0.117 g of X is combined with 0.509 g of Y. State the law illustrated by these chemical combinations.

Elements X and Y are from two different compounds. In the first, $0.324$ g of X is combined with $0.471$ g of Y. In second, $0.117$ g of X is combined with $0.509$ g of Y. State the law illustrated by these chemical combinations.