Question

बिफोर बर्निंग इन एयर द मैग्नीशियम रिबन इस क्लीयर्ड बाय रबिंग विद अस एंड पेपर फॉर ब्वॉय​

Answer 1

QUESTION:-

Before burning Magnesium ribbon in air it rubbed with sand paper why?

Answer:-

Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.