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Answer :
The formulae are:
(i) sodium oxide \(\rightarrow \) Na\( _2 \)O
(ii) aluminium chloride \(\rightarrow \) AlCl\( _3 \)
(iii) sodium sulphide \(\rightarrow \) Na\( _2 \)S
(iv) magnesium hydroxide \(\rightarrow \)Mg (OH)\( _2 \)