p-Block Elements-I - Result Question 18
####18. Statement $IAl(OH) _3$ is amphoteric in nature.
Statement II $Al-O$ and $O-H$ bonds can be broken with equal ease in $Al(OH) _3$.
(1998, 2M)
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Answer:
Correct Answer: 18. Three centre two electron bond or banana bond.
Solution:
- Due to small size and high charge on $Al$ in $Al(OH) _3$ the fission ability of $Al-O$ and $O-H$ bonds become comparable and compound can give both $H^{+}$and $HO^{-}$under appropriate reaction conditions as:
$$ \underset{\text { Base }}{Al(OH) _3}+3 HCl \longrightarrow AlCl _3+3 H _2 O $$
$$ Al(OH) _3+NaOH \longrightarrow Na\left[Al(OH) _4\right] $$
Therefore, both statements are correct and statement II is a correct explanation of statement I.
