Assertion $\left(\mathrm{A}\right):$ Covalent character follows: $\mathrm{NaCl}<{\mathrm{MgCl}}_2<{\mathrm{BeCl}}_2<\mathrm{LiCl}$
Reason $\left(\mathrm{R}\right):$ According to Fajan's rules, covalent character of ionic compounds increases with decrease in size of cation.

Which of the following statements are correct ?

(A) Both $\mathrm{LiCl}$ and ${\mathrm{MgCl}}_2$ are soluble in ethanol.

(B) The oxides ${\mathrm{Li}}_2\mathrm{O}$ and $\mathrm{MgO}$ combine with excess of oxygen to give superoxide.

(C) $\mathrm{LiF}$ is less soluble in water than other alkali metal fluorides.

(D) ${\mathrm{Li}}_2\mathrm{O}$ is more soluble in water than other alkali metal oxides.

Choose the most appropriate answer from the options given below

Arrange the following in the decreasing order of their covalent character :

(A) $\mathrm{LiCl}$

(B) $\mathrm{NaCl}$

(C) $\mathrm{KCl}$

(D) $\mathrm{CsCl}$

Choose the most appropriate answer from the options given below

Find out the correct order of ionic character in the following molecules

$\left(\mathrm{i}\right) {\mathrm{SO}}_2$     $\left(\mathrm{ii}\right) {\mathrm{K}}_2\mathrm{O}$     $\left(\mathrm{iii}\right) {\mathrm{N}}_2$    $\left(\mathrm{iv}\right) \mathrm{LiF}$

Order of Covalent bond;

A. $\mathrm{KF}>\mathrm{KI}; \mathrm{LiF}>\mathrm{KF}$

B. $\mathrm{KF}<\mathrm{KI}; \mathrm{LiF}>\mathrm{KF}$

C. ${\mathrm{SnCl}}_4>{\mathrm{SnCl}}_2; \mathrm{CuCl}>\mathrm{NaCl}$

D. $\mathrm{LiF}>\mathrm{KF}; \mathrm{CuCl}>\mathrm{NaCl}$

E. $\mathrm{KF}<\mathrm{KI}; \mathrm{CuCl}>\mathrm{NaCl}$

The number of following factors which affect the percent covalent character of the ionic bond is______

A) Polarising power of cation

B) Extent of distortion of anion

C) Polarisability of the anion

D) Polarising power of anion

Arrange the following in increasing order of their covalent character.

(A) ${\mathrm{CaF}}_2$

(B) ${\mathrm{CaCl}}_2$

(C) ${\mathrm{CaBr}}_2$

(D) ${\mathrm{CaI}}_2$

Choose the correct answer from the options given below.

Give a reason for the following:

Ionic compounds have a high melting point.