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JEE Main levelSingle correct optionDifficulty 2 of 3pt202

On the basis of the electronegativity difference alone, which compound has the highest ionic character in its bond? (Pauling values: Cs 0.79, Li 0.98, Na 0.93, K 0.82, F 3.98, Cl 3.16, I 2.66)

A $LiF$
B $NaCl$
C $KI$
D $CsF$

Answer: D

Ionic character increases with

Δ χ

. The differences are

LiF

3.00,

NaCl

2.23,

KI

1.84 and

CsF

3.19. The largest is for

CsF

.

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