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Magnesium oxide is MgO, magnesium hydrox...

Magnesium oxide is `MgO`, magnesium hydroxide is `Mg(OH)_2` and magnesium sulphate is `MgSO_4` What would be the formulae of barium oxide, barium hydroxide and barium sulphate if barium belongs to the same group, as magnesium ?

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As barium and magnesium belong to the same group, barium has the same valency as magnesium. But the valency of magnesium is indicated to be two from the formulae of its compounds given in the question. Therefore, valency of barium is also two. The formulae of barium oxide, barium hydroxide and barium sulphate respectively are :
`BaO, Ba(OH)_2 and Ba SO_4`
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