The following question consist of two statements – Assertion (A) and Reason (R).
Answer the following question selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Assertion (A) : On burning magnesium in oxygen, the mass of magnesium oxide
formed is equal to the total mass of magnesium and oxygen.
Reason (R) : In a chemical substance, the elements are always present in a definite
proportion.
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Answer:
both A abd R are tere and R ic correct explanation of A
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