Subjective Type

What are amphoteric oxides? Give two examples of amphoteric oxides.

Solution

An amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide.

Zinc oxide $$ (ZnO)$$ reacts with both acids and with bases:
In acid: $$ZnO + 2H^+ \rightarrow Zn^{2+} + H_2O$$
In base: $$ZnO + H_2O + 2 OH^- \rightarrow [Zn(OH)_4]^{2-}$$

Aluminium oxide
with acid:$$ Al_2O_3 + 3 H_2O + 6 H_3O^+(aq) \rightarrow 2 [Al(H_2O)_6]^{3+}(aq)$$
with base: $$Al_2O_3 + 3 H_2O + 2 OH^-(aq) \rightarrow 2 [Al(OH)_4]^-(aq)$$

SIMILAR QUESTIONS

p - block Elements

Which of the following is an amphoteric oxide?

p - block Elements

Which one of the following is an amphoteric oxide?

p - block Elements

Which of the following oxides reacts with Both $$HCl$$ and $$NaOH$$ ?

p - block Elements

In the following sets of reactants which two sets exhibit the amphoteric character of $$Al_2O_3.xH_2O$$? Set 1 : $$Al_2O_3.xH_2O$$ (s) and $$OH^-(aq)$$ Set 2 : $$Al_2O_3.xH_2O$$ (s) and $$H_2O (l)$$ Set 3 : $$Al_2O_3.xH_2O$$ (s) and $$H^+ (aq)$$ Set 4 : $$Al_2O_3.xH_2O$$ (s) and $$NH_3 (aq)$$

p - block Elements

Which of the following oxide is amphoteric?

p - block Elements

The option(s) with only amphoteric oxides is (are):

p - block Elements

Which of the following sets of oxides is amphoteric in nature?

p - block Elements

Which of the following is not an amphoteric ion?

p - block Elements

Which of the following is amphoteric oxide? $$Mn_2O_7, \, CrO_3, \, Cr_2O_3, \, CrO, \, V_2O_5, \, V_2O_4$$

p - block Elements

Select the amphoteric substance in the following :

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