Q 1.     Write down the formulae of

            (i) sodium oxide

            (ii) aluminium chloride

            (iii) sodium suphide

            (iv) magnesium hydroxide

Answers (1)

The Formula of given compounds are : 

(i) sodium oxide :

 \Rightarrow Na_2O

(ii) aluminium chloride:

\Rightarrow AlCl_3

(iii) sodium sulphide:

\Rightarrow Na_2S

 (iv) magnesium hydroxide:

\Rightarrow Mg(OH)_2

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