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Question

Match the chemical formulae with the corresponding compounds.

A
Hydrogen bromide
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B
Lithium oxide
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C
Aluminium oxide
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D
Sodium chloride
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Solution

Sodium chloride: Symbol of sodium is Na and its valency is 1; symbol of chlorine is Cl and its valency is 1. Criss-crossing the valencies, the formula of the compound will be NaCl.

Lithium oxide: Symbol of lithium is Li and its valency is 1; symbol of oxygen is O and its valency is 2. Criss-crossing the valencies, the formula of the compound will be Li2O.

Aluminium oxide: Symbol of aluminium is Al and its valency is 3; symbol of oxygen is O and its valency is 2. Criss-crossing the valencies, the formula of the compound will be Al2O3.

Hydrogen bromide: Symbol of hydrogen is H and its valency is 1; symbol of bromine is Br and its valency is 1. Criss-crossing the valencies, the formula of the compound will be HBr.

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