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Percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. This proves the law of

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Reciprocal proportions

Constant proportions

Conservation of mass

Multiple proportions

answer is A.

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Detailed Solution

Given statement regarding CuO follows the law of Constant proportion because from where is the source of Cu and O, they always combine in a definite or constant proportion that is required for the formation of CuO.

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