Question

We were given the answers for this question but I don't know how to get to those answers.

Identify the p-block group to which X belongs:

i) X2O3

ii) XO

iii) X2O

Answer 1

i) The maximum oxidation number of P-block element is equal to its group number.

X2O3.. Here, the oxidation number of X is +3.

Hence, X belongs to 3rd group.

Example: Al2O3.

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XO.. Here, the oxidation number of X is +2

Hence, X belongs to 2nd group. but 2nd group elements are s-block elements. P-block elements exibits oxidation number +2 is IVA group.

Example: .CO

Hence, X is IVA group element.

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III)

X2O.. Here, the oxidation number of X is +1

Hence, X belongs to 1st group. but 1st group elements are not P-block elements. P-block elements exibits oxidation number +1 is VIIA group.

Hence, X is VIIA group element.

Example: Cl2O