Chapter 15, Problem 15.88QP

(a)

Interpretation Introduction

Interpretation:

The oxides in each of the given groups has to be arranged in order of increasing basicity

Concept Information:

Oxides of metals and non-metals may be,

Acidic-exhibits acidic character

Basic-exhibits basic character

Amphoteric-exhibits both acidic and basic  character

Neutral-does not exhibit any of the acidic or basic character

Except Beryllium oxide, all the oxides of alkali metals and alkaline earth metal are basic in nature.

None of the oxides of non-metals show basic property.

Oxides of non-metals with higher oxidation number of the main group elements are highly acidic whereas those with lesser oxidation number does not exhibit measurable acidic properties.

Beryllium oxide ($\text{BeO}$) and many of the metallic oxides of Group 3A and 4A are amphoteric

Order of Basicity:

The basicity of metal oxides depends on the oxidation number of the metal ions.

The most basic oxides occur with metal ions having the lowest positive charges (or lowest oxidation numbers).

To Arrange: The oxides ${\text{K}}_{\text{2}}\text{O,}{\text{BaO and Al}}_{\text{2}}{\text{O}}_{\text{3}}$ in the order of increasing basicity

(b)

Interpretation Introduction

Interpretation:

The oxides in each of the given groups has to be arranged in order of increasing basicity

Concept Information:

Oxides of metals and non-metals may be,

Acidic-exhibits acidic character

Basic-exhibits basic character

Amphoteric-exhibits both acidic and basic  character

Neutral-does not exhibit any of the acidic or basic character

Except Beryllium oxide, all the oxides of alkali metals and alkaline earth metal are basic in nature.

None of the oxides of non-metals show basic property.

Oxides of non-metals with higher oxidation number of the main group elements are highly acidic whereas those with lesser oxidation number does not exhibit measurable acidic properties.

Beryllium oxide ($\text{BeO}$) and many of the metallic oxides of Group 3A and 4A are amphoteric

Order of Basicity:

The basicity of metal oxides depends on the oxidation number of the metal ions.

The most basic oxides occur with metal ions having the lowest positive charges (or lowest oxidation numbers).

To Arrange: The oxides ${\text{CrO}}_{\text{3}}\text{,}\text{CrO}{\text{and Cr}}_{\text{2}}{\text{O}}_{\text{3}}$ in the order of increasing basicity