Question

why magnesium ribbon is cleaned with sand papers before burning​

Answer 1

Answer:

Magnesium ribbon should be cleaned with sandpaper before burning in the air. ... To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.

Answer 2

Answer:

Bcoz there are impurities which can affect the reaction and may result into the failure of the reaction