Chapter 9.2, Problem 26LC

Interpretation Introduction

Interpretation: From the given formulas of compounds, whether the formula is correct or not is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 26LC

Options a, b, and c are incorrect as the charges are not balanced.

Explanation of Solution

The given compound in option a is ${\text{Mg}}_{\text{2}}{\left({\text{SO}}_{\text{4}}\right)}_{\text{3}}$ . It is composed of ${\text{Mg}}^{2+}$ and ${\text{SO}}_{\text{4}}{}^{2-}$ . The formula is incorrect as the charges are not balanced. The correct formula is ${\text{MgSO}}_{\text{4}}$ .

The given compound in option b is ${\text{AsRb}}_{\text{3}}$ . It is not an ionic compound as the first element As is metalloid and Rb is metal.

The given compound in option c is ${\text{BeCl}}_{\text{3}}$ . It is composed of ${\text{Be}}^{2+}$ and ${\text{Cl}}^{-}$ . The formula is incorrect as the charges are not balanced. The correct formula is ${\text{BeCl}}_{\text{2}}$ .

The given compound in option d is NaF. It is composed of ${\text{Na}}^{+}$ and ${\text{F}}^{-}$ ions. The formula is correct as the charges are balanced.

Thus, options a, b, and c are incorrect.