Question

e)
classify the following oxides into acidic,basic,neutral and amphoteric.
Na, NO, CO, CaO, SO, NO, ZnO, H,O, PbO, CO, MgO ,A1,0, (4)​

Answer 1

Answer:

basic oxides,acidic oxides,amphoteric oxides and neutral oxides.

Explanation:

Acidic oxide: These compounds can also be called as acid anhydrides. Acid anhydrides usually have a low melting and boiling point except for compounds like B2O3 and SiO2 which have high melting points and form giant molecus.                                                                                                                                ie;  NO,CO2

SO3 + H2O → H2SO4

B2O3 + H2O → 2H3BO3.

Amphoteric oxide:  aluminium oxide

Acidic characteristics:

AL2O3 + 6HCl → 2Al3+ + 6Cl– + 3H2O

Basic characteristics:

Al2O3 +2OH– + 3H2O → 2[Al (OH)4]–.

Neutral Oxides: Some compounds react with oxygen to form oxides which do not exhibit acidic nor basic characteristics. Such compounds are called as neutral compounds of oxygen.

Example: NO, CO.

Basic oxide: Metals react with oxygen to give basic compounds of oxygen. These compounds are usually ionic in nature. Group 1, 2 and lanthanides form basic compounds of oxygen when they react with dioxygen. During the formation of these compounds, a large amount of energy is released. These compounds readily react with water except a few exceptions.

Examples: M2O3, MO2, ThO2

Na2O + H2O → 2NaOH.