Question

assertion : - magnesium must be cleaned before it is burnt in air

reason:- it can give better burning experience

please tell its answer​

Answer 1

Answer: Both A and R are correct and R is the correct explanation of A.

Explanation: Magnesium is an active metal which reacts with atmospheric O2, and other gases to form its salts. Keeping it for long durations in air can lead to the coating of magnesium carbonate, its oxide, etc. which may not lead to desired results. It must be cleaned with a sand paper.

Reaction:-

$\rm 2Mg \ (s) + O_2 \ (g) \rightarrow 2MgO \ (s)$