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e) in production of sodium compounds such as borax, caustic soda, sodium., , hosphate etc., i) Quick ime:, , It is used:, , a. in the , glass and calcium carbide., b. In the, , c. In softening of hard water d. As a flux in the extraction of metal, It is used, a) as building material, b) in the manufacture of quick lime, c) in Solvay process to prepare Na2CO; as it is a source of CO2, d) in metallurgy for the extraction of iron, e) in toothpaste and certain cosmetics, y) Cement: It is an important building material. It is used in concrete and reinforced, , concrete, in plastering and in the construction of bridges, dams and buildings., vi) Paster of pars eis wed, , a) in making moulds for pottery and ceramics etc., b) in surgical bandages for setting broken bones of the body, c) for making statues, models, decorative materials and black board chalk., “+ Biological importance of Ca and Mg, i) Magnesium ions are concentrated in animal cells and Calcium ions are, concentrated in body fluids, outside the cell., ii) All enzymes that utilize ATP in phosphate transfer require magnesium ion, as cofactor., iii) In green plants magnesium is present in chlorophyll., iv) Calcium and magnesium ions are also essential for the transmission of, impulses along nerve fibres., v) Calcium ions are important in blood clotting and are required to trigger the, contraction of muscles., vi) Calcium ions also regulate the beating of the heart., , @