100g of mercuric oxide decompose to give 92.6g of mercury and 7.4g of oxygen and 10g of oxygen react completely with 125g of mercury to give mercuric oxide these point will follow - law

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law of constant proportions

law of multiple proportions

law reciprocal proportions

law of conservation of mass

answer is B.

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Detailed Solution

According to law of constant proportions the weight ratio of atoms of elements in a compound must be constant by sources they are extracted.

Weight ratio of Hg and O in HgO is $200: 16 or 25: 2$

From the given data, weight ratio of Hg and O is

$Hg : O = 125 : 10 (or) 25 : 2$

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