Question

Statement-1: Lithium chloride is predominantly covalent compound.
Statement-2: Electronegativity difference between Li and Cl is small.
A) Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement-1.
B) Statement-1 is true, Statement-2 is true and Statement-2 is not correct explanation for Statement-1
C) Statement-1 is true, Statement-2 is false.
D) Statement-1 is false, Statement-2 is true.

Answer 1

Hint: We know that Fajan’s rule predicts whether a compound bond will be covalent or ionic. Barely any ionic bonds have fractional covalent attributes which were first examined by Kazimierz Fajan’s in 1923. In the time with the assistance of X-beam crystallography, he had the option to anticipate ionic or covalent holding with qualities like ionic and nuclear span.

Complete step by step answer:
Let us discuss the postulates of Fajan’s rule as follows,
Size of the particle: Smaller the size of cation, the bigger the size of the anion, more prominent is the covalent character of the ionic bond.
The charge of Cation: Greater the charge of cation, more prominent is the covalent character of the ionic bond.
Electronic setup: For cations with same charge and size, the one, with \[\left( {n - 1} \right){d^n}n{s^o}\] which is found experiencing significant change components have more prominent covalent character than the cation with \[n{s^2}n{p^6}\] electronic configuration, which is usually found in salt or soluble earth metals
As indicated by Fajans rule, smaller the cation, the more is the polarizing power and, hence, more is the polarization which prompts more covalent character. Because of the smallest size of lithium, it gives covalent chloride. There is a high contrast between the electronegativities of Lithium and Chloride. Therefore Statement-I is correct; Statement-II is incorrect.

So, the correct answer is Option C.

Note: We have to know that polarizing power is the degree to which a cation can spellbind an anion. It is corresponding to charge thickness. Charge thickness is the proportion of charge to volume. Polarizing power α Charge thickness. More the charge thickness, more prominent is the polarizing power for that cation.
Polarisability: It is the degree to which a particle can be captivated. It can likewise be called the straightforwardness with which a particle can be energized. Polarization is the mutilation of a roundly symmetric electron cloud to an unsymmetrical cloud.