Oxalate ion behaves as a ________ ligand.
Correct answer: B. Bidentate
- A. Unidentate
- B. Bidentate
- C. Tridentate
- D. Hexadentate
Explanation
The oxalate ion, C2O4^2-, has two oxygen donor atoms that can attach to the same metal ion, forming a chelate ring. Students may choose unidentate because they treat the whole oxalate ion as having only one negative charge-bearing group instead of counting its donor atoms.
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About Shape of Ionic Crystals
Ionic crystal shape depends on the regular arrangement of oppositely charged ions in a three-dimensional lattice. The topic covers coordination number, radius ratios, lattice geometry and structures such as sodium chloride, caesium chloride and zinc sulfide, which should not be confused with the molecular shapes predicted by VSEPR theory.
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