Chapter 15, Problem 72RQ

Interpretation Introduction

Interpretation:

The reason due to which compound CaO is considered as an anhydrous base, but ${\text{SO}}_2$ is considered as an anhydrous acid is to be discussed.

Concept Introduction:

Bronsted-Lowry acids is the species that donates ${\text{H}}^{+}$, and those which accept ${\text{H}}^{+}$ are considered as Bronsted-Lowry bases. The species formed when a Bronsted-Lowry acid donates ${\text{H}}^{+}$ is called its conjugate base, while that formed when Bronsted-Lowry base accepts ${\text{H}}^{+}$ is called its conjugate acid.

Oxides of metals of $s$ block are basic in nature, as these get hydrolyzed to form alkalis or bases. Oxides of metals of $p$ block are slightly basic or amphoteric, while that of non-metals are acidic in nature, as these get hydrolyzed to form acids.