Assertion: Pure water obtained from different sources such as river,
well, sea etc. always contain hydrogen and oxygen in the
ratio of 1:8 by mass.
wodillamosa
Reason: Mass of reactants and products during chemical changes is
always equal.
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a and r is correct and r is not correct explanation of a
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sorry bro woh maine tumhara pura answer nhi dekha tha
thanks bro
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