Question

why should a magnesium ribbon should be clean before burning in air ?? mbf-ieya-ppq come

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.

Explanation:

Answer 2

the magnesium ribbon should be cleaned with a. Sand paper before burning to remove the layer of magnesium oxide formed on it which prevents the ribbon from burning.