The polarizability of an anion is directly proportional to its .

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.

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

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

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

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

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$