A) \[~MgC{{l}_{2}}\]
B) \[~BaC{{l}_{2}}~\]
C) \[~CaC{{l}_{2}}\]
D) \[~BeC{{l}_{2}}\]
Correct Answer: B
Solution :
Key Idea: Lattice energy increases as we go down the group so melting point also increases on going down the group. \[\therefore \]among \[MgC{{l}_{2}},BaC{{l}_{2}},CaC{{l}_{2}}\]and \[BeC{{l}_{2}},BaC{{l}_{2}}\]has to highest melting point.
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