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Which one of the following is a correct statement about oxide of boron and aluminium?

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$Al$ is more acidic than that of $B$

$B$ is basic while that of $Al$ is amphoteric

$B$ is acidic while that of $Al$ is amphoteric

$B$ and $Al$ are amphoteric

answer is C.

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Detailed Solution

As we move down the group, the acidic character decreases and the basic character increase. So, $B_{2} O_{3}$ is acidic oxide, ${Al}_{2} O_{3}$ and ${Ga}_{2} O_{3}$ are amphoteric oxide, and ${In}_{2} O_{3}$ are basic oxide.

Therefore, the correct option is (C).

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