The electrometallurgical process (electrolysis of fused salts) is employed to extract

Sodium is employed because of its high electropositive character. 83. Which of the following is not an ore of magnesium? (a) Carnallite (b) Magnesite (c) Dolomite (d) Gypsum Chemical formula of carnallite is 3 2 KMgCl .6H O and it is an ore of magnesium. The chemical formula of magnesite is 3 MgCO which is a magnesium carbonate mineral. Dolomite is the mineral generally found in rocks and it is a calcium magnesium carbonate mineral with the chemical formula 3 2 CaMg(CO ) . Gypsum is a mineral containing sulphur calcium dihydrate and its chemical formula is 2 2 CaSO .2H O and this is not