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Give the formulae of the compounds formed from the following sets of elements
(a) Calcium and fluorine
(b) Hydrogen and Sulphur
(c) Nitrogen and hydrogen
(d) Carbon and chlorine
(e) Sodium and oxygen
(f) Carbon and oxygen

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Answer:

(a) Calcium and fluoride - Calcium Fluoride (CaF_{2})
(b) Hydrogen and sulphur - Hydrogen Sulphide (H_{2}S)
(c) Nitrogen and hydrogen - Ammonia (NH_{3})
(d) Carbon and chlorine - Carbon Tetrachloride (CCl_{4})
(e) Sodium and oxygen - Sodium Oxide (Na_{2}O)
(f) Carbon and oxygen - Carbon dioxide (CO_{2}); Carbon Monoxide (CO)

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