Why mercury chloride is more covalent than cadmium and zinc chloride?

1. According to the Fajan's rule, either cation or anion having large charge on it form higher covalent compounds.

2. Among Zn, Cd and Hg, Hg has large amount of charge. This is because, Zn and Cd form M2+ type cations but Hg cation is Hg22+

3. Thus, more charge, more covalent character.

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