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Aluminium & its compoundsp-block Group 13 & 14

Which reactions prove that Aluminium is amphoteric?

Expert Answer

It reacts with acids to release $H_2$ : $2Al + 6HCl \rightarrow 2Al^{3+} + 6Cl^- + 3H_2$ It reacts with bases to release $H_2$ : $2Al + 2NaOH + 6H_2O \rightarrow 2Na^+[Al(OH)_4]^- + 3H_2$

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