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Why Al(2)O(3) is amphoteric while B(2)O(...

Why `Al_(2)O_(3)` is amphoteric while `B_(2)O_(3)` is acidic ?

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Why is Al_(2)O_(3) amphoteric oxide?

Which of the following statements is//are correct? I. B_(2)O_(3) is an acidic oxide II. Ga_(2)O_(3) and Al_(2)O_(3) are amphoteric oxides. III. In_(2)O_(3) and tl_(2)O_(3) are basic oxides.

Al_(2)O_(3) reacts with

Statement-1: Al forms H_(2) when reacts with NaOH. Statement-2: Al_(2)O_(3) is amphoteric by nature. Statement-3: Al_(2)O_(3) is a neutral oxide.

Aluminium oxide, Al_(2)O_(3) is

0.078 g Al(OH)_(3) . is dehydrated to Al_(2)O_(3) . The Al_(2)O_(3) so obtained reacted with 6 milli-equivalent of HCl . The equivalent of AlCl_(3) produced during the reaction are:

What is the nature of Al_(2)O_(3) and B_(2)O_(3) ?