The correct order as indicated in each option | vedclass

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(A) In option $A$,the cation is the same $(Ca^{2+})$ while the anions are different ($F^-$,$Cl^-$,$Br^-$).According to Fajan's rule,as the size of the

Vedclass · Accepted Answer

$CaF_2 > CaCl_2 > CaBr_2$ (Melting point)

Vedclass · Answer

(A) In option $A$,the cation is the same $(Ca^{2+})$ while the anions are different ($F^-$,$Cl^-$,$Br^-$).According to Fajan's rule,as the size of the anion increases,the covalent character of the ionic bond increases.As the covalent character increases,the lattice energy and melting point decrease.Therefore,the correct order of melting point is $CaF_2 > CaCl_2 > CaBr_2$.Option $B$ is incorrect because the dipole moment order is $CH_3Cl > CH_3F > CH_3Br$ due to the high electronegativity of $Cl$ and bond length factors.Option $C$ is incorrect as the extent of overlapping follows the order $ns-ns > ns-np > np_{\pi}-np_{\pi}$.Option $D$ is incorrect because the bond order of $H_2$ is $1$,while $H_2^+$ and $H_2^-$ have a bond order of $0.5$,making $H_2$ the most stable,but $H_2^+$ and $H_2^-$ are not equal in stability due to electron-electron repulsion in $H_2^-$.

The correct order as indicated in each option is:

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