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

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Solution

The Law of Constant Composition, discovered by Joseph Proust, is also known as the Law of Definite Proportions. It is different from the Law of Multiple Proportions although both stem from Lavoisier's Law of Conservation of Mass. The French chemist Joseph Proust stated this law the following way: "A chemical compound always contains the same elements combined together in the same proportion by mass."

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Q. Law of constant proportion states that a chemical compound always contains the same elements combined in a fixed proportion by mass.

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

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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).

In law of constant proportion, the word constant means that the mass ratio of the elements in a chemical compound will always remain same.

State true or false. In law of constant proportion, the word constant means that the mass ratio of the elements in a chemical compound is same everywhere in the universe.

Hydrogen and oxygen combine to form two compounds the hydrogen content in one is 5.93 % and in other it is 11.2% show that this explain law of multiple proportion

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