[" Q U E S T I O IV D "],[" Why should a magnesium ribbon be cleaned before burning in air? "]

Why should a magnesium ribbon be chleaned before burning in air ?

Why should a magnesium ribbon be cleaned before is burnt in air ?

With what, magnesium ribbon is cleaned before buning it in air.

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

(a) Define the following in terms of gain or loss of hydrogen with one example each: (i) oxidatin (ii) reduction (b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reactin. Name (i) substance oxidised, and (ii) substance reduced.