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Write the chemical formula of the following: 

(a) Magnesium chloride 

(b) Calcium oxide 

(c) Copper nitrate 

(d) Aluminium chloride 

(e) Calcium carbonate

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(a) Magnesium chloride →MgCl

(b) Calcium oxide →CaO 

(c) Copper nitrate →Cu(NO3)2 

(d) Aluminium chloride →AlCl3 

(e) Calcium carbonate →CaCO3

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