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21.6 gm of copper is dissolved in nitric acid and heated to give 27 gm of CuO. 2.3 gm of another sample of CuO on reduction with hydrogen gave 1.88 gm of Cu.The percentage of Cu in both samples is same indicates that the given data obeys

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law of constant proportions

law of combining volumes

law of reciprocal proportions

law of multiple proportions

answer is D.

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different samples of the same compound contains eleements in the same proportions by mass

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