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Q.

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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a

Reciprocal proportions

b

Constant proportions

c

Conservation of mass

d

Multiple proportions

answer is A.

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Detailed Solution

As we know there are various methods to prepare Copper oxide $CuO$ . And from all the methods it was observed that the by weight ratio of $Cu : O$ was found to be same i.e., 4: 1.
Molar weight of $Cu$ molar weight $O$ = 64:16 = 4:1.
law of constant proportions says that, a pure compound always contains the same elements combined together in the same definite proportion by weight.

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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