Question

(a) What are amphoteric oxides ? Give two examples of amphoteric oxides.
(b) Choose the acidic oxides, basic oxides and neutral oxides from the following :
Na2O ; CO2 ; CO ; SO2; MgO ; N2O ; H2O.
(c) Which of the following are amphoteric oxides :
MgO, ZnO, P2O3, Al2O3, NO2

Lakhmir Singh Chemistry Class 10

Answer 1

a) Those metal oxides which show basic as well as acidic behavior are known as amphoteric oxides .
Example : Aluminum oxide and Zinc oxide .

b) Acidic oxide - CO2 , CO , SO2 and N2O : Basic oxide - Na2O , MgO ; Neutral oxide - H2O .

c) ZnO , Al2O3

Answer 2

Answer:

• (a)"Oxides that exhibit both acidic and basic behavior are known as amphoteric oxides. Amphoteric oxides exhibit characteristics of both basic and acidic oxides, neutralizing both acids and bases.
• In water, amorphous oxides dissolve to produce alkaline solutions. Hydroxide ions are present in alkaline liquids. Al2O3 interacts with hydrochloric acid to produce aluminium chloride and water as a result. It produces sodium aluminate (NaAlO2) and water from sodium hydroxide solution. The common amphoteric oxides ZnO, SnO, and PbO are other examples.
• Oxygen molecules known as amphoteric oxides exhibit both acidic and basic properties. As these oxides interact with acid, a neutralization reaction occurs, resulting in the formation of salt and water. This exemplifies the compounds' fundamental characteristics. Similar to this, the alkali exhibits an acidic quality when salt and water are formed. For illustration, aluminium oxide.
• (b) Basic- MgO, acidic- Na2O, SO2, CO2 neutral- H2O,CO,N2O
• (c)ZnO, Al2O3 are amphoteric.

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