Chapter 4.9, Problem 6QQ

Interpretation Introduction

Interpretation:

Among the given options, the binary ionic compound that has a name which includes a Roman numeral has to be chosen.

Concept Introduction:

An ionic compound has two elements one is metal and another one is non-metal.  The metal ion has always positive charge and the non-metal ion has always negative ion called binary compounds.

Example: ${\text{NaCl, CO}}_{\text{2}}$.  Here $\text{NaCl}$ is ionic and carbon dioxide is binary compound.

Depending upon the chemical circumstances metal atoms able to form more than one type of ion is called variable charge metal.

Example – Fe forms ${\text{Fe}}^{\text{2+}}$ and ${\text{Fe}}^{\text{3+}}$ ion.

If variable charge metal atom is there in ionic compound and the naming can be done by using Roman numerals.