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Work out the formula for sulphur dioxide. (Valencies : S = 4; O = 2)
Valency of Sulphur = 4
Valency of Oxygen = 2
Elements : S O
Valency : 4 2
Formula for sulphur dioxide can be worked out by crossing the valency of the constituent elements.
Thus, formula of sulphur dioxide is S2O4.
The formula has a common factor of 2.
Therefore, dividing the formula by the common factor gives chemical formula: SO2.
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