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Irrespective of the source, pure sample of water always yields `88.89%` mass of oxygen and `11.11%` mass of hydrogen. This is explained by the law of
A. (a)Conservation of mass
B. (b)Constant composition
C. (c )Multiple proportions
D. (d)Constant volume

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Correct Answer - B
`H_(2)O` contains `H` and `O` in a fixed ratio by mass. It illustrates the law of constant composition.

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