Question

Mg-MgO-Mg(OH)2-MgCl2-Mg(NO3)2

Answer 1

1) 2Mg + O2 → 2MgO
2) MgO + 2NaCl → MgCl2 + Na2O
     MgCl2 + 2KOH → Mg(OH)2 + 2KCl
3)  Mg(OH)2 + 2HCl → MgCl2 + 2H2O
4)  MgCl2 + Zn(NO3)2 → ZnCl2 + Mg(NO3)2

Answer 2

The given sequence of compounds is: Mg - MgO - Mg(OH)2 - MgCl2 - Mg(NO3)2.

This sequence represents the following reactions:

1. Mg + O2 → MgO (Combustion of magnesium metal to form magnesium oxide)
2. MgO + H2O → Mg(OH)2 (Reaction of magnesium oxide with water to form magnesium hydroxide)
3. Mg(OH)2 + 2HCl → MgCl2 + 2H2O (Reaction of magnesium hydroxide with hydrochloric acid to form magnesium chloride and water)
4. Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O (Reaction of magnesium hydroxide with nitric acid to form magnesium nitrate and water)

So, the sequence represents a series of chemical reactions starting with magnesium metal and leading to the formation of magnesium chloride and magnesium nitrate.