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Q.

Which of the alkali metal chloride is expected to have highest melting point ?

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a

LiCl

b

NaCl

c

KCl

d

RbCl

answer is A.

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Detailed Solution

The lattice energy of alkali metal halides decreases down the group due to increase in size of alkali metals. Thus,

LiCl	NaCl	KCl	RbCl	CsCl
$883^{0} C$	$808^{0} C$	$772^{0} C$	$717^{0} C$	$645^{0} C$

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