Magnesium oxide is produced by the calcination of magnesium phosphate or magnesium sulphate by the treating magnesium chloride with lime followed by heat.

Q. Assertion :Magnesium ribbon is ignited with a heated wire. Reason: Magnesium ribbon is ignited by heated wire to give magnesium oxide.

Q. Assertion :Sodium chloride is added during electrolysis of fused anhydrous magnesium chloride. Reason: Anhydrous magnesium chloride is obtained by heating hydrated magnesium chloride, $MgC{l}_2.6H_{2}O$.

Q. Write the formulae of the following compounds, showing the steps involved.

(a) sodium oxide
(b) magnesium nitrate
(c) magnesium sulphate
(d) aluminium chloride

Q. When water is added to magnesium oxide ,magnesium hydroxide is produced which is also present in lime water .So, is it correct that the magnesium hydroxide present in lime water and the magnesium hydroxide formed from magnesium oxide and water are one and the same?

Q. How does Magnesium Oxide give Magnesium Sulphate?