A) \[LiCl\]
B) \[NaCl\]
C) \[KCl\]
D) \[CsCl\]
Correct Answer: D
Solution :
Alkali metal halides have high melting point. The melting points of alkali metal chloride decreases from \[NaCl\] to\[CsCl\]. (except\[Li)\]. \[\underset{833\,\,K}{\mathop{LiCl}}\,\] \[\underset{1081\,\,K}{\mathop{NaCl}}\,\] \[\underset{1043\,\,K}{\mathop{KCl}}\,\] \[\underset{990\,\,K}{\mathop{RbCl}}\,\] \[\underset{918\,\,K}{\mathop{CsCl}}\,\] So, \[NaCl\] has highest melting point and \[CsCl\] has lowest melting point.
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