Q. 204.3( 3 Votes )

The symbols of some of the ions are given below

Na+, Mg2+, H+, Cl, S2–

Using this information, find out the formulae of

(i) sodium carbonate

(ii) magnesium chloride

(iii) hydrogen sulphide

Answer :

(i) Sodium carbonate


By applying criss-cross method:



Formula: Na2CO3


Thus, the formula for sodium carbonate is Na2CO3.


(ii) Magnesium chloride


By applying criss-cross method:



Formula: MgCl2


Thus, the formula for magnesium chloride is MgCl2.


(iii) Hydrogen sulphide


By applying criss-cross method:



Formula: H2S


Thus, the formula for hydrogen sulphide is H2S.


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