Assertion(A): The magnesium ribbon must be clean before the burning test.
Reason (R):  Magnesium ribbon has a coating of magnesium oxide on its surface.

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Assertion is true but the reason is false.

Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

Both assertion and reason are true, reason is the correct explanation of assertion.

Assertion is false but the reason is true.

answer is A.

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Detailed Solution

Since magnesium ribbon has a layer of magnesium oxide on it, it must be cleaned before burning in the air. It is created as a result of the delayed response of damp air on it. This makes it harder for magnesium to burn.

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