Which of the following is strongest acidic oxide?

S b_{2} O_{3}

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P_{2} O_{5}

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S O_{2}

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S O_{3}

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Solution

The correct option is D $S O_{3}$
$S b_{2} O_{3} + H_{2} O \to H_{2} S b_{2} O_{4}$
$P_{2} O_{5} + H_{2} O \to H_{3} P O_{3}$ (phosphorous acid)
$S O_{2} + H_{2} O \to H_{2} S O_{3}$ (sulphurous acid)
$S O_{3} + H_{2} O \to H_{2} S O_{4}$ (sulphuric acid)
Acidic character :- $H_{2} S O_{4} > H_{2} S O_{3} > H_{3} P O_{3} > H_{2} S b_{2} O_{4}$ .
$∴ S O_{3}$ strongest acidic oxide.

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