NCERT Solutions for Chapter 1 Chemical Reactions and Equations from Class 10 Page 6 Question 1 Why should a magnesium ribbon be cleaned before burning in air? Answer: Magnesium is a very reactive metal like Na , Ca etc. When magnesium is exposed to air, it reacts with oxygen to form a layer of magnesium oxide. 2Mg + O2 ------->2 MgO This layer of magnesium oxide … [Read more...] about Chapter 1 Chemical Reactions and Equations