The percentage of copper and oxygen in a sample of CuO obtained from different methods were found to be same. This proves the law of :

Constant proportion

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Multiple proportion

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Reciprocal proportion

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None of these

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Solution

The correct option is B Constant proportion
The percentage of copper and oxygen in a sample of CuO obtained from different methods were found to be same. This proves the law of Constant proportion as the ratio of Cu:O remains constant

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