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Two elements that form oxides of the type XO₃ are:

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P and S

S and Cr

Cr and P

Al and S

answer is B.

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Detailed Solution

Two elements that form oxides of the type XO₃ are S and Cr.
Electronic configuration of oxygen = 2, 6
Valency of oxygen
= $8 - 6$
$= 2$
Both sulphur (S) and barium (Ba) share their outer shell electrons with oxygen (O) to form compounds.

Oxygen shares its 2 valence electrons to complete its octet and can form oxides like SO₃and CrO₃_.

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