Question

The incorrect order of lattice energy is

• A. $Al{F}_3>Mg{F}_2$
• B. $L{i}_{3}N>L{i}_{2}O$
• C. $NaCl>LiF$
• D. $TiC>ScN$

Answer 1

Answer: (C)

The incorrect order of lattice energy is $NaCl>LiF$ as lattice energy of LiF is more than NaF
$LE\propto \frac{q^{+}.q^{-}}{r^{+}+r^{-}}$
A. $Al{F}_3>Mg{F}_2$ [Charge on cation]
B. $L{i}_{3}N>L{i}_{2}O$ [Charge on anion]
C. $NaCl<LiF$ [Size of cation and anion]
D. TiC > ScN [Charges on cation and anion].