Question

The residue which left after burning of Magnesium ribbon called??

Answer 1

HEYA
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.

Answer 2

The magnesium ribbon burns with a dazzling white flame and changes into white powder.
This white powder is magnesium oxide which forms due to the reaction between magnesium and oxygen present in air.

Hope it helps.

Have a good day dear.