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An element A forms an oxide A2O5.
(a) What is the valency of element A?
(b) What will be the formula of chloride of A?
(a) Element A forms an oxide A2O5. On crossing the valencies, we see that the valency of O (oxide) is −2 and that of element A is 5.
(b) Formula of chloride of A:
Element/Ion A Cl−
Valency 5 −1
The formula of the chloride of element A (by crossing over the valencies) is ACl5.
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