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Write the molecular formulae of : (a) ...

Write the molecular formulae of :
(a) Sodium sulphide
(b) Magnesium oxide
(c) Calcium hydroxide
(d) Hydrogen chloride
(e) Sulphuric acid
(f) Iron (II) sulphide
(g) Iron (III) sulphite (h) Nitric acid
(i) Calcium phosphate
(j) Aluminium sulphate
(k) Magnesium nitride

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