Question

when magnesium ribbon is burnt in air what will be formed

Answer 1

When burned in air with a Bunsen burner it produces a bright white flame/light. Never look directly at it as it will hurt your eyes. After burning they produce magnesium oxide. here's an equation for it :2Mg + O2 ----- 2MgO

We will get magnesium hydroxide which is basic in nature because all metallic oxides are basic in nature.

Answer 2

When magnesium metal is burned in air (Figure 3.5), two products are produced. One is magnesium oxide, MgO. The other is the product of the reaction of Mg with molecular nitrogen, magnesium nitride. When water is added to magnesium nitride, it reacts to form magnesium oxide and ammonia gas.
:)