Question

Which of these are ionic compounds? Check all that apply.

Answer 1

$\text{NH}_4$, KF and MgO are ionic compounds.

Further Explanation:

Covalent bond

The type of bond that includes the sharing of electron pairs between the constituent atoms in a compound is known as a covalent bond. The electron pairs are therefore called bonding or shared pairs.

Ionic bond

The force of interaction between a positively and a negatively charged species is termed as an ionic bond. These charged species are known as ions. Cations are the species formed when there occurs a loss of electrons by the neutral atom whereas anions result from the gain or addition of electrons to the uncharged atom.

Electronegativity difference $(\Delta\text{EN})$ is a key factor in predicting whether a bond is polar or nonpolar. If $\Delta\text{EN}$ is less than 0.4, the bond is a nonpolar covalent bond. If $\Delta\text{EN}$  is between 0.4 and 1.7, the bond is a polar covalent bond. If $\Delta\text{EN}$ comes out to be greater than 1.7, the bond is ionic.

$\text{NH}_4\text{Cl}$

In this molecule, the constituent particles are ${\text{NH}}_4^ +$ and $\text{Cl}^-$ ions. There is a formation of an ionic bond between the two and therefore $\text{NH}_4\text{Cl}$  is an ionic compound.

 $\text{SO}_2$

Here, both the constituents are nonmetals so the compound is a covalent compound.

FCl

The electronegativity of fluorine is 4.0 while that of chlorine is 3.0 so their electronegativity difference in FCl comes out to be 1.0 and therefore this molecule is a polar covalent compound.

KF

Here, K is an electropositive metal so it loses an electron that is gained by electronegative F atom, resulting in the formation of an ionic bond between the two. So KF is an ionic compound.

$\text{NH}_3$  

Here, nitrogen and hydrogen are the constituent particles of the compound and both are nonmetals so $\text{NH}_3$ is a covalent compound.

MgO

Here, magnesium acts as metal and forms cation by the removal of an electron from it. Oxygen, being electronegative, accepts this electron and forms an anion. The interaction between $\text{mg}^{2+}$ and $\text{O}^{2-}$ ions is an ionic bond so MgO is an ionic compound.

Therefore $\text{NH}_4$, KF and MgO are ionic compounds.

Learn more:

1. What is a typical characteristic of an ionic compound? brainly.com/question/6071838
2. What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: ionic bond, covalent bond, nitrogen, hydrogen, NH4Cl, MgO, KF, FCl, SO2, NH3.

Answer 2

I think the correct answers from the choices listed above are the first, third and the last option. Ionic compounds are compounds that dissociates into ions when in aqueous solution. From the list, NH4Cl, KF and MgO are the ionic compounds. Hope this answers the question.