Statement 1 (S1): A chemical compound always contains the same elements combined in the same proportion by mass.
Statement 2 (S2): The law of constant proportions is also known as the law of chemical combination.

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Solution

A chemical compound always contains the same elements combined in the same proportion by mass. This is according to the law of constant proportions.
So, S1 is true.

The law of constant proportions and law of conservation of mass are collectively known as the law of chemical combinations.
So, S2 is false.

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Similar questions

Fill in the blanks:

(a) Matter is neither …………….. nor ……………... in a chemical reaction.

(b) In a compound, the constitute elements are always present in a definite proportion by ……………. .

(d) The combining capacity of an element is known as its ………………. .

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

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