A&R - Law of constant proportions — task. Chemistry CBSE Live product, Class 9 (2026-27).

Pick out the right answer:

Assertion (A):	If two samples of a pure compound have different mass ratios of their constituent elements, both samples cannot represent the same pure compound.
Reason (R):	Every pure compound has a characteristic fixed composition.

Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A
Both Assertion (A) and Reason (R) are true, but R is not the correct explanation of A
Assertion (A) is true, but Reason (R) is false
Assertion (A) is false, but Reason (R) is true

Did you find an error?

5. A&R - Law of constant proportions