Question

An element X shows variable valency 3 and 5 What will the formula of its oxide

Answer 1

Answer:

let the element X

case 1:

valency of X=+3

valency of oxide O=-2

so the formula for the oxides of the element $X=X_{2} O_{3}$

case 2:

valency of X=+5

valency of O=-2

so the formula for the oxides of the element $X=X_{2} O_{5}$