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  • Although metals form basic oxides, which of the following metals form an amphoteric oxide (a) Na (b) Ca (c) Al (d) Cu

Although metals form basic oxides, which of the following metals form an amphoteric oxide?
(a) Na
(b) Ca
(c) Al
(d) Cu

Answers (1)

Ans. (c)

(a) Na - Sodium oxide (Na2O) is a strongly basic oxide.
It contains oxide ion, O2-, which is a very strong base and has a high tendency to combine with hydrogen ions.
(b) Ca - Calcium oxide (CaO) is basic in nature. It dissolves in water to form calcium hydroxide
(c) Al - Aluminium oxide (Al2O3) shows basic as well as acidic behavior hence it is called an amphoteric oxide.
(d) Cu - Copper(II) oxide or cupric oxide (CuO)
              Copper(I) oxide or cuprous oxide (Cu2O)
Both are basic in nature

Therefore option (c) is correct

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