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