By Pajan's rule covalent character increases with increase in size of the anion. Identify the correct order of melting point of calcium.

Question

By Pajan's rule covalent character increases with increase in size of the anion. Identify the correct order of melting point of calcium. (A) CaF2 < CaCl2 < CaBr2 < CaI2 (B) CaCl2 < CaF2 < CaBr2 < CaI2 (C) CaF2>CaCl2>CaBr2>CaI2 (D) CaCl2>CaF2>CaBr2>CaI2

Tardigrade Admin · Accepted Answer

According to Fajan's rule, Covalent character propto size of anion propto (1/ text melting point ) (∵ Attraction decreases ) Thus, the order of melting point is CaF 2> CaCl 2> CaBr 2> CaI 2

Q. By Pajan's rule covalent character increases with increase in size of the anion. Identify the correct order of melting point of calcium.

$C a F_{2} < C a C l_{2} < C a B r_{2} < C a I_{2}$

$C a C l_{2} < C a F_{2} < C a B r_{2} < C a I_{2}$

$C a F_{2} > C a C l_{2} > C a B r_{2} > C a I_{2}$

$C a C l_{2} > C a F_{2} > C a B r_{2} > C a I_{2}$

According to Fajan's rule, Covalent character
$\propto$ size of anion $\propto \frac{1}{melting point}$
$(∵$ Attraction decreases $)$
Thus, the order of melting point is
$C a F_{2} > C a C l_{2} > C a B r_{2} > C a I_{2}$

Q. By Pajan's rule covalent character increases with increase in size of the anion. Identify the correct order of melting point of calcium.

CaF2​<CaCl2​<CaBr2​<CaI2​

CaCl2​<CaF2​<CaBr2​<CaI2​

CaF2​>CaCl2​>CaBr2​>CaI2​

CaCl2​>CaF2​>CaBr2​>CaI2​

According to Fajan's rule, Covalent character ∝ size of anion ∝ melting point 1​ (∵ Attraction decreases ) Thus, the order of melting point is CaF2​>CaCl2​>CaBr2​>CaI2​

$C a F_{2} < C a C l_{2} < C a B r_{2} < C a I_{2}$

$C a C l_{2} < C a F_{2} < C a B r_{2} < C a I_{2}$

$C a F_{2} > C a C l_{2} > C a B r_{2} > C a I_{2}$

$C a C l_{2} > C a F_{2} > C a B r_{2} > C a I_{2}$

According to Fajan's rule, Covalent character
$\propto$ size of anion $\propto \frac{1}{melting point}$
$(∵$ Attraction decreases $)$
Thus, the order of melting point is
$C a F_{2} > C a C l_{2} > C a B r_{2} > C a I_{2}$