JEE MAIN - Chemistry (2022 - 26th July Evening Shift - No. 2)
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.
B < A < C < D
A < B < C < D
A < B < D < C
A < C < B < D
Explanation
From Fajan's rule, for a given metal ion, as the size of anion increases, polarizability of anion increases and hence covalent character of the given ionic compound increases.
Hence, the increasing order of covalent character is $\mathrm{CaF}_{2}<\mathrm{CaCl}_{2}<\mathrm{CaBr}_{2}<\mathrm{Cal}_{2}$
Hence, the increasing order of covalent character is $\mathrm{CaF}_{2}<\mathrm{CaCl}_{2}<\mathrm{CaBr}_{2}<\mathrm{Cal}_{2}$
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