The correct order as indicated in each option | vedclass

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(A) $1$. For $CaF_2, CaCl_2, CaBr_2$,the melting point decreases as the size of the anion increases due to increased covalent character (Fajan's rule)

Vedclass · Accepted Answer

$CaF_2 > CaCl_2 > CaBr_2$ (Melting point)

Vedclass · Answer

(A) $1$. For $CaF_2, CaCl_2, CaBr_2$,the melting point decreases as the size of the anion increases due to increased covalent character (Fajan's rule). Thus,$CaF_2 > CaCl_2 > CaBr_2$ is correct.$2$. For $CH_3F, CH_3Cl, CH_3Br$,the dipole moment order is $CH_3Cl > CH_3F > CH_3Br$ because the bond length increase in $C-Cl$ outweighs the electronegativity difference in $C-F$.$3$. The extent of overlapping follows the order $ns-ns > ns-np > np_{\pi}-np_{\pi}$.$4$. Stability is determined by bond order. $H_2$ (bond order $1$) $> H_2^+$ (bond order $0.5$) $= H_2^-$ (bond order $0.5$). Thus,$H_2 > H_2^+ = H_2^-$ is correct.Note: Both $A$ and $D$ are technically correct statements based on chemical principles.

List-$I$	List-$II$
$(1)$ Hydrogen bond	$(A)$ ${\rm{C}}$
$(2)$ Resonance	$(B)$ ${\rm{LiF}}$
$(3)$ Ionic solid	$(C)$ ${\rm{H}}_2$
$(4)$ Covalent solid	$(D)$ ${\rm{HF}}$
	$(E)$ ${\rm{O}}_3$

The correct order as indicated in each option is

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Match the items in List-$I$ with the appropriate examples in List-$II$.

List-$I$ List-$II$

$(1)$ Hydrogen bond $(A)$ ${\rm{C}}$

$(2)$ Resonance $(B)$ ${\rm{LiF}}$

$(3)$ Ionic solid $(C)$ ${\rm{H}}_2$

$(4)$ Covalent solid $(D)$ ${\rm{HF}}$

$(E)$ ${\rm{O}}_3$

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