Question

6. What are redox reactions?
7. Why should a magnesium ribbon be cleaned before burning it?

Answer 1

6) Reaction in which both oxidation and reduction takes place.

7) Reason why magnesium ribbon cleaned because to clear the impurities on the ribbon also to get good flame

Answer 2

Redox reaction is a reaction in which both reduction reaction an Oxidation reaction are involved and when a magnesium ribbon remains exposed to moist air a white layer of magnesium oxide is formed on its surface is Hinders that burning of magnesium hence this layer is first removed by rubbing with Sandpaper before burning