Question

Why is it advised to rub magnesium ribbon with sandpaper before burning it in air next number

Answer 1

because a thin layer of magnesium is formed on magnesium due to which reaction doesn't take place properly plz mark on me as brain list

Answer 2

when it is exposed to air it starts reacting with oxygen and forms metal oxides. With Mg the oxide layer forms a white coating on the outside of the metal thal will slowdown burning. The ribbons should be sanded with the sand paper to remove the layer.


hope this answer helps you