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Q.

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

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a

Conservation of mass

b

Constant composition

c

Multiple proportions

d

Constant volume

answer is B.

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Detailed Solution

H2O contains H and O in a fixed ratio by mass(2 : 16 = 1:8). It illustrates the law of constant composition.
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