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  •  In the following sets of reactants which two sets best exhibit the amphoteric character of Al2O3 . xH2O ? Set 1: <img alt="\dpi{100} Al_{2}O_{3}\; .

 In the following sets of reactants which two sets best exhibit the amphoteric character of Al2O3 . xH2O ?

Set 1: \dpi{100} Al_{2}O_{3}\; .\; xH_{2}O\; (s)\; and\; OH^{-}\; (aq)

Set 2: Al_{2}O_{3}\; .\; xH_{2}O\; (s)\; and\; H_{2}O\; (l)

Set 3: Al_{2}O_{3}\; .\; xH_{2}O\; (s)\; and\; H^{+}\; (aq)

Set 4: Al_{2}O_{3}\; .\; xH_{2}O\; (s)\; and\; NH_{3}\; (aq)

Option: 1

 1 and 2


Option: 2

 1 and 3


Option: 3

 2 and 4


Option: 4

 3 and 4


Answers (1)

best_answer

Amphoteric species is a molecule or ion that can react both as an acid and as a base

Aluminium hydroxide is amphoteric

In set 1, Al(OH)^{-}_{4} is formed showing electrophilic nature

In set 3, Al^{3+} is formed with H_{2}O showing nucleophilic nature.  

Therefore, option (2) is correct.

 

Posted by

Divya Prakash Singh

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