Question

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An element B shows valencies of 4 and 6 . Write the formula of its two oxides.

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Answer 1

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The valence of Oxygen is -2.

So when B shows the valence as 4 the formula formed is BO2. And when B shows the valence as 6 the formula formed is BO3.

Hence, when an element B shows valence numbers of 4 and 6, the formulae of its two oxides is BO2 and BO3 

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Answer 2

the element is sulphur the formula is so2 h2so4