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Things are complicated if we use the term valency.

It is better to use the term Oxidation state or Oxidation Number.

In SO2, the oxidation state of sulphur is +4

and In SO3, the oxidation state of sulphur is +6.

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13y ago
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14y ago

Oxygen is always 2-, so to balance the molecule SO2 the sulphur here must be 4+.

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11y ago

Valency of sulphur in sulphur trioxide is 6.

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12y ago

S = +6 valency

O = -2 valency

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12y ago

24

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9y ago

Is 3

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Q: What is the valency of sulphur in SO3?
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