Chemistry
Why are zinc and aluminium considered to have a unique nature. Give balanced equations to support your answer.
Hydrogen
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Answer
Zinc and aluminium are considered to have a unique nature because:
(i) They can react with acids and can even react with hot conc. alkalis to form hydrogen and a soluble salt.
Zn + 2NaOH ⟶ Na2ZnO2 + H2
2Al + 6NaOH ⟶ 2Na3AlO3 + 3H2
Zn + 2HCl ⟶ ZnCl2 + H2
2Al + 6HCl ⟶ 2AlCl3 + 3H2
(ii) Their oxides and hydroxides are amphoteric in nature i.e., they react with both bases and acids to give salt and water.
ZnO + 2HCl ⟶ ZnCl2 + H2O
ZnO + 2NaOH ⟶ Na2ZnO2 + H2O
Al2O3 + 6HCl ⟶ 2AlCl3 + 3H2O
Al2O3 + 2NaOH ⟶ 2NaAlO2 + H2O
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