Water is a compound which consists of hydrogen and oxygen elements combined together in a fixed ratio of 3 :1.

True

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False

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Solution

The correct option is B False
Law of constant proportions:
According to this law, a chemical compound always has the same proportion of elements by mass.
Thus, a chemical compound always contains the element in a fixed ratio by mass.
For example, pure water obtained from rivers, sea, well, etc always contains hydrogen and oxygen combined together in the ratio of 1:8 by mass.
Thus, the given statement is False. I.e., Water is a compound which consists of hydrogen and oxygen elements combined together in a fixed ratio of 3 :1.

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Similar questions

Q. Water is formed by the chemical combination of hydrogen and oxygen.
A molecule of water consists of 2 atoms of hydrogen and 1 atom of oxygen, combined chemically. Figure 1 represents the molecules in liquid water (black – oxygen atom; gray – hydrogen atom).

Which of the following represents water molecules after liquid water is vaporized on boiling?

(a)

(b)

(c)

Hydrogen combines with oxygen to form two compounds namely water and hydrogen peroxide. In this reaction the masses of oxygen which combine with a fixed mass of hydrogen bear a simple ratio. The given statement can be explained on the basis of:

Q. Law of constant proportion given by Joseph Proust that a chemical compound always consists of same element combined together in the same proportion by mass but there are some compound which are allotropic for example hydrogen and oxygen forms compound water which can be H2O or D2O that is heavy oxygen so this law should be wrong. This is same compound but with different mass

A.L. Lavoisier, in the year(1)_____ showed that water is a compound of (2)_______ and (3)______ atoms combined together in the ratio of (4)_______

Q. Assertion :Pure water obtained from different sources such as river, well, spring, sea etc. always contain hydrogen and oxygen combined in the ratio

1 : 8

by mass. Reason: A chemical compound always contains elements combined together in same proportion by mass, it was discovered by French chemist, Joseph Proust (1799).

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