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Coincidence! the oxidation number of sulfur in sufate is +6, in sulfite is +4. Sulfate is SO42-, sulfite is SO32- Personally I do not like using the word valency in this context, valency usually refers to elements- and is the number of bonds that an elemnt can form to other elemnts- it is an old term. In the context of ions charge seems to be a better word.

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10y ago
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AnswerBot

2d ago

The valency of sulfate (SO4^2-) and sulfite (SO3^2-) ions is the same because they both have a charge of 2-. This means that they both need to gain two electrons to achieve a stable electron configuration, resulting in a valency of 2.

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Q: Why is the valency of sulphate and sulphite same?
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