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Question


Write down the formulae of the following compounds:

(i) Potassium oxide

(ii) Aluminium Nitride

(iii) Hydrogen sulfide

(iv) Calcium hydroxide


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Solution

(i) Valency of potassium is 1 and valency of oxygen is 2 hence chemical formula will be K2O.

(ii) Valency of Aluminium is 3 and valency of Nitrogen is also 3, hence the chemical formula is AlN.

(iii) Valency of Hydrogen is 1 and valency of Sulphur is 2, hence the chemical formula is H2S.

(iv) Valency of Calcium is 2 and valency of Hydroxide ion is 1, hence the chemical formula is Ca(OH)2.


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