Question

For each of the following compounds, state whether it is ionic or covalent, and if it is ionic, write the symbols for the ions involved: (a) KClO4 (b) Mg(C2H3O2 )2 (c) H2S (d) Ag2S (e) N2Cl4 (f) Co(NO3)2

Answer 1

Answer :

Covalent compound : It is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound.

The covalent compound are usually formed when two non-metals react.

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

All the polyatomic ions always form an ionic compound.

Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.

For the given options:

Option A:  $KClO_4$

This compound is formed by the combination of potassium, $K^+$ which is a metal and $ClO_4^-$ ion which is a polyatomic ion. Thus, it will form an ionic compound.

Option B:  $Mg(C_2H_3O_2)_2$

This compound is formed by the combination of magnesium, $Mg^{2+}$ which is a metal and $C_2H_3O_2^{-}$ ion which is a polyatomic ion. Thus, it will form an ionic compound.

Option C:  $H_2S$

Hydrogen and sulfur, both are non-metals and they will form a covalent compound.

Option D:  $Ag_2S$

This compound is formed by the combination of silver, $Ag^{+}$ which is a metal and sulfur, $S^{2-}$ which is a non-metal. Thus, it will form an ionic compound.

Option E:  $N_2Cl_4$

Nitrogen and chlorine, both are non-metals and they will form a covalent compound.

Option F:  $Co(NO_3)_2$

This compound is formed by the combination of cobalt, $Co^{2+}$ which is a metal and $NO_3^{-}$ ion which is a polyatomic ion. Thus, it will form an ionic compound.

Answer 2

Classifying each of the Compounds into Ionic or covalent :

a) $KClO_{4}$  is an ionic compound.  The ions = $K^+$ and $ClO_{4}^-$

b) $Mg(C2H3O2 )2$ is  an ionic compound. The ions = $Mg^{2+}$ and $C_{2}H_{3}O_{2} ^-$

c) $H_{2} S$  is a covalent compound formed by two non-metals ( hydrogen and sulfur )

d) $Ag_{2} S$  is an ionic compound. The ions = $Ag^+$  and $S^{2-}$

e) $N_{2} Cl_{4}$ is a covalent compound formed by Nitrogen and Chlorine ( Non-metals )

f) $CO(NO_{3} )_{2}$ is an ionic compound. The ions = $CO^{2+}$ and $NO_{3} ^{-}$

Ionic compounds are compounds formed by the transfer of electrons from one atom to another atom. and polyatomic ions form Ionic compounds

while Covalent bonds are formed by the sharing of electrons between atoms that forms the compound. this kind of bond forms when Non-metals react with each other.

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