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

A burning magnesium ribbon will continue to burn in

Carbondioxide does not support combustion but a burning magnesium ribbon continues to burn in it. Why?

Which one is obsorved while a magnesium ribbon burning ?

Why should we eat food?

A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and then cooled with water. The gas evolved is

What happens when magnesium ribbon is burnt in air? What type of substance is formed when it is dissolved in water?

The compound formed when magnesium ribbon is burnt in oxygen is-

Why should weeds be removed?

Why should one sort wastes carefully before discarding them from home ?

Why should we recyle paper?