The mass ratio of copper and oxygen in samples of CuO obtained by different methods were found to be same. This illustrates the:

law of conservation of mass

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law of constant proportion

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Avogadro's law

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law of multiple proportion

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Solution

The correct option is B law of constant proportion
$∙$ Even if the same compound is obtained by different methods, the mass ratio of its constituent elements remains the same.

$∙$ For example, the compound CuO can be obtained by the decomposition of ${CuCO}_{3}$ or ${Cu(NO}_{3})_{2}$ .

$∙$ The atomic mass of Cu and O are 64 and 16 respectively.

$∙$ However, the mass ratio of copper and oxygen in CuO is 4:1 and is constant irrespective of its source.

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Irrespective of the source, pure sample of water always yields 88.89% by mass of oxygen and 11.11% mass of hydrogen. This illustrates the law of

(A)constant proportion
(B)conservation of mass
(C)multiple proportion
(D)reciprocal proportion

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