If the percentage of copper and oxygen in different samples of $C u O$ obtained by different methods are equal. This illustrates the law of :

constant proportions

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conservation of mass

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multiple proportions

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reciprocal proportions

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Solution

The correct option is A constant proportions
As the percentage of copper and oxygen are same in different samples, it illustrates law of constant proportions as copper and oxygen are combining in a fixed ratio.

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If the percentage of copper and oxygen in different samples of CuO obtained by different methods are equal. This illustrates the law of :

The correct option is A constant proportionsAs the percentage of copper and oxygen are same in different samples, it illustrates law of constant proportions as copper and oxygen are combining in a fixed ratio.

If the percentage of copper and oxygen in different samples of $C u O$ obtained by different methods are equal. This illustrates the law of :

The correct option is A constant proportions
As the percentage of copper and oxygen are same in different samples, it illustrates law of constant proportions as copper and oxygen are combining in a fixed ratio.