1.

If an element x form highest oxide of the formula xo3,then it belongs to which group?

Answer»

∵An element x form highest oxide of the formula XO₃.
∴ oxidation state of Oxygen will be lowest and we KNOW , lowest oxidation number of oxygen is -2 .

∴ oxidation number of X + 3 { -2 } = 0 [ because molecule is neutral so, SUM of oxidation of atoms = 0 ]
⇒ oxidation number of X = +6
e.g., highest oxidation number of X = +6
∵ group number = 10 + highest oxidation number [ this METHOD applied when oxidation number >3 ]
∴ group number = 10 + 6 = 16

Hence, ELEMENTS LIES in 16th group


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