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(a) An element X exhibits variable valen...

(a) An element X exhibits variable valencies 3 and 5. Write the formulae of the chlorides of the element.
(b) What is the ratio by mass of the elements present in the chemical formula of magnesium oxide

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(a) The formulae of the hlorides of the element X = XCl and XCl.
(b) The chemical formula of magnesium oxide is MgO. The elements are present in the ratio of 24: 16 or 3 2.
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