A chemical compound always contains the elements combined in fixed proportion by mass.

True

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False

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Solution

The correct option is A True
According to the law of constant proportions any compound is made up of elements in a definite proportion by mass. Also, this proportion does not depend on the source of the compound.

Hence, water ( $H_{2} O$ ) will always have hydrogen to oxygen atoms in the ratio of 2:1, in its molecule, regardless of its source.

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