Chapter 14, Problem 14.40CP

(a)

Interpretation Introduction

Interpretation:

Sulphur, Selenium, Chlorine and Bromine are has to be located in the periodic table.  In the given binary acids, strongest and weakest acid has to be identified and explained.

Concept Introduction:

For binary acids, the element present in the same group of periodic table, strength of $\text{H-A}$ bond is important to determine an acidity.  $\text{H-A}$ bond strength decreases down a group because of overlapping between $\text{1s}$ orbital of the Hydrogen atom and more diffusion, larger $p$ orbital of A atom increases the strength if an acid and so decreases with increasing size of the element.

(b)

Interpretation Introduction

Interpretation:

Sulphur, Selenium, Chlorine and Bromine are has to be located in the periodic table.  In the given oxoacid acids, strongest and weakest acid has to be identified and explained.

Concept Introduction:

Oxoacids have general formula is ${\text{H}}_{\text{n}}{\text{YO}}_{\text{m}}$, where Y is non-metallic atom ($\text{C,}\text{N,}\text{S and Cl}$) and n, m are integers.  Y is always bonded to one or more $\text{OH}$ group.  Strength of an acid increases with increasing electronegativity of Y.