Question

Which of the following are not ionic compounds?
(i) $KCl$
(ii) $HCl$
(iii) $CC{l}_4$
(iv) $NaCl$

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (i) and (iii)

Answer 1

The correct option is B (ii) and (iii)

Hint: Ionic compounds are formed by the transfer of electrons.

Step 1:

Metals are good electron donors and non-metals are good electron acceptors. So, the bonds form between metal and non-metal are ionic bonds, and the compound formed is called an ionic or electrovalent compound.

Example: For $KCl$ ionic compound where $K$ is metal and $Cl$ is non-metal.

$K\to K^{+}+e^{-}$ ----- 1

$\frac{1}{2}C{l}_2+e^{-}\to C{l}^{-}$ ----- 2

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Overall reaction: $K+\frac{1}{2}C{l}_2\to KCl$

Two non-metals form bonds by sharing electrons and such bonds are called covalent bonds and the compounds formed are called covalent compounds.

Step 2:

(i) $KCl:K$ is a metal and $Cl$ is a non-metal. So, the bond form between them is an ionic bond and the compound form is an ionic compound.

(ii) $HCl:H$ is a non-metal and $Cl$ is also a non-metal. So, the bond form between them is a covalent bond and the compound form is a covalent compound.

(iii) $CC{l}_4:C$ is a non-metal and $Cl$ is also a non-metal. So, the bond form between them is a covalent bond and the compound form is a covalent compound.

(i) $NaCl:Na$ is a metal and $Cl$ is a non-metal. So, the bond form between them is an ionic bond and the compound form is an ionic compound.

Step 3:

So, among the given compounds, $KCl$ and $NaCl$ are ionic compounds, and $HCl$ and $CC{l}_4$ are covalent compounds.
Final step: Hence the correct option is (B): (ii) and (iii).