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Question

Chemistry Question on GROUP 1 ELEMENTS

Lowest melting point chloride is:

A

LiCl\text{LiCl}

B

NaCl\text{NaCl}

C

KCl\text{KCl}

D

CsCl\text{CsCl}

Answer

CsCl\text{CsCl}

Explanation

Solution

Alkali metal halides have high melting point. The melting points of alkali metal chloride decreases from NaCI to CsCl. (except Li).
LiCl833 K     NaCl 1081 K    KCl1043 K     RbCl990 K    CsCl918 K \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.