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  4. In the following sets of reactants which two sets best exhibit the amphoteric character of Al2O3 . xH 2O? Set 1: Al2O3 . xH2O (s) and OH- (aq) Set 2: Al2O3 . , xH2O (s) and H2O (l) Set 3: Al2O3 . xH2O (s) and H+ (aq) Set 4: Al2O3 . , xH2O (s) and NH3 (aq)

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Q. In the following sets of reactants which two sets best exhibit the amphoteric character of $Al_2O_3 . xH _2O$?
Set 1 : $Al_2O_3 . xH_2O (s)$ and $OH^- (aq)$
Set 2 : $Al_2O_3 . , xH_2O (s)$ and $H_2O (l)$
Set 3 : $Al_2O_3 . xH_2O (s)$ and $H^+ (aq)$
Set 4 : $Al_2O_3 . , xH_2O (s)$ and $NH_3 (aq)$

JEE MainJEE Main 2014The s-Block Elements

Solution:

ln set 1 : $Al\left(OH\right)_{4}^{-}$ is formed

ln set 2 : $Al^{+3} \& H_{2}O$ is formed