Which of the following is a highly basic oxide?

S O_{2}

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S O_{3}

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T e O_{2}

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T e O_{3}

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Solution

The correct option is C $T e O_{2}$
In a group, basicity increases down the group in oxides.
Now
$T e O_{2} H_{2} O \to H_{2} T e O_{3}$
$T e O_{3} \to H_{2} T e O_{4}$
Now, tellorous acid is less acidic than telluric acid
$∴ T e O_{2}$ more basic than $∴ T e O_{3}$

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