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Which pair of compounds among LiCl, RbCl, BeCl2, and MgCl2 shows the highest and the lowest ionic character, respectively?

1. LiCl and RbCl
2. MgCl2 and BeCl2
3. RbCl and BeCl2
4. RbCl and MgCl2

Correct answer: RbCl and BeCl2

Solution

RbCl exhibits high ionic character due to the large size and low charge density of Rb+, which leads to weaker lattice energy, while BeCl2 has a covalent character because of the small size and high charge density of Be2+, resulting in significant polarization of the chloride ions.

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