
Which of the following has covalent bonds?
A) \[{\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}\]
B) \[{\rm{AlC}}{{\rm{l}}_{\rm{3}}}\]
C) \[{\rm{NaH}}\]
D) \[{\rm{MgC}}{{\rm{l}}_{\rm{2}}}\]
Answer
164.1k+ views
Hint: A covalent bond is formed due to the share of electrons between atoms. The covalent character defines the measure of an atom’s tendency to attract an electron pair towards itself. Here, we have to identify the covalent character in these ionic compounds.
Complete step by step solution:Let’s discuss the Fazan’s rule that helps to determine the covalent character of these compounds. Fazan’s rule stated that an anion’s covalent nature increases with increase of its polarization. The extent of an atom’s polarization is dependent on two factors namely the cation’s polarizing power and the anion’s polarizability.
Let’s discuss some polarizing properties of cations.
1) When the size of a cation increases, its polarizing property decreases.
2) When the charge of cation increases, its covalent character also increases.
3) Cations having the pseudo noble gas configuration have more covalent character.
Let’s discuss the given ionic compound. So, we have to observe the cations. The charges of the cations are \[{\rm{N}}{{\rm{a}}^{\rm{ + }}},{\rm{A}}{{\rm{l}}^{{\rm{3 + }}}},{\rm{M}}{{\rm{g}}^{{\rm{2 + }}}}\] . Among the cations, aluminium has the charge of +3, that is, (\[{\rm{A}}{{\rm{l}}^{{\rm{3 + }}}}\]), more the charge on cation, the size decreases, that causes the increase of the tendency of the cation to polarise the anion. Therefore, it shows the highest covalent character.
Hence, option B is right.
Note: It is to be noted that, when the size of anions increases, its covalent character also increases. Also, the increase of the charge of anion means the increase of the covalent character of the compound.
Complete step by step solution:Let’s discuss the Fazan’s rule that helps to determine the covalent character of these compounds. Fazan’s rule stated that an anion’s covalent nature increases with increase of its polarization. The extent of an atom’s polarization is dependent on two factors namely the cation’s polarizing power and the anion’s polarizability.
Let’s discuss some polarizing properties of cations.
1) When the size of a cation increases, its polarizing property decreases.
2) When the charge of cation increases, its covalent character also increases.
3) Cations having the pseudo noble gas configuration have more covalent character.
Let’s discuss the given ionic compound. So, we have to observe the cations. The charges of the cations are \[{\rm{N}}{{\rm{a}}^{\rm{ + }}},{\rm{A}}{{\rm{l}}^{{\rm{3 + }}}},{\rm{M}}{{\rm{g}}^{{\rm{2 + }}}}\] . Among the cations, aluminium has the charge of +3, that is, (\[{\rm{A}}{{\rm{l}}^{{\rm{3 + }}}}\]), more the charge on cation, the size decreases, that causes the increase of the tendency of the cation to polarise the anion. Therefore, it shows the highest covalent character.
Hence, option B is right.
Note: It is to be noted that, when the size of anions increases, its covalent character also increases. Also, the increase of the charge of anion means the increase of the covalent character of the compound.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Chemical Properties of Hydrogen - Important Concepts for JEE Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

Atomic Structure - Electrons, Protons, Neutrons and Atomic Models

Displacement-Time Graph and Velocity-Time Graph for JEE

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

JEE Advanced Weightage 2025 Chapter-Wise for Physics, Maths and Chemistry

NCERT Solutions for Class 11 Chemistry In Hindi Chapter 1 Some Basic Concepts of Chemistry

Degree of Dissociation and Its Formula With Solved Example for JEE

Instantaneous Velocity - Formula based Examples for JEE

JEE Main 2025: Conversion of Galvanometer Into Ammeter And Voltmeter in Physics
