Question

When magnesium ribbon is burnt in air and the ash is collected in China dish it contains

Answer 1

Answer:

Burning Mg ribbon in free air

This is not unreasonable given that the temperature of burning Mg is much greater than the 850oC noted above and although Mg3N2 burns in O2 to form MgO, the rapid cooling of the ash might preserve any nitride present.

Answer 2

Answer:

The ribbon burns with a bright white light. Intense heat is also produced in this reaction. Here, when magnesium burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide. Chemical equation: Magnesium plus Oxygen gives Magnesium oxide.