Assertion: Water molecules always contain hydrogen and oxygen in ratio 1:8.
Reason: Water obeys laws of constant proportions irrespective of source and method of preparation

All samples of water contain hydrogen and oxygen in the mass ratio 1:8 . This is in agreement with the law of

Assertion: Pure water obtained from different sources always contains hydrogen and oxygen in the ratio of 1 : 8 by mass. Reason: Molecular mass of water is 18.

Ratio in hydrogen and oxygen in water molecule by volume is

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions Assertion (A) - Pure water obtained from different sources, such as river, well, spring, sea etc. always contains hydrogen and oxygen in ratio of 1:8 by mass Reason (R) - Mass of reactants and products during chemical or physical changes is always constant