1.

Assertion(A): On burning magnesium in oxygen, the mass of magnesiumoxide formed is equal to the total mass of oxygen and magnesium.Reason(R): In a chemical substance, the elements are always present in aconstant proportion.(a) Both assertion (A) and reason (R) are true and reason (R) is thecorrect explanation of assertion (A).(b) Both assertion (A) and reason (R) are true but reason (R) is not thecorrect explanation of assertion (A).(c) Assertion (A) is true but reason (R) is false.(d) Assertion (A) is false but reason (R) is true

Answer»

ANSWER:

(b) Both ASSERTION (A) and reason (R) are TRUE but reason (R) is not the

correct EXPLANATION of assertion (A).

Explanation:



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