Question

The chemical formula of oxide of an element 'X' is X2O5.write the chemical formula of its chloride.

Answer 1

The chemical formula of the said compound i.e X₂O₅shows that the valency of X is 5 whereas that of O is 2. For the chloride formation with X, the valency of X will be 5 and for Cl it will be 1 . So the chemical formula of the compound formed is XCl₅.