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Assertion (A) : Magnesium ribbon is clea...

Assertion (A) : Magnesium ribbon is cleaned with water before burning .
Reason (R ) : MgO layer is formed on magnesium ribbon , on exposure to atmosphere .

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 R is true .

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