(Solved): 7. Which one of the following species is a potential polydentate ligand (chelating agent)? A) \( \m ...

7. Which one of the following species is a potential polydentate ligand (chelating agent)? A) \( \mathrm{NH}_{3} \) B) \( \mathrm{Cl}^{-} \) C) \( \mathrm{CN}^{-} \) D) \( \mathrm{H}_{2} \mathrm{O} \) E) \( \mathrm{C}_{2} \mathrm{O}_{4} \) 2- 8. Does either or both cis- or trans-[Mn(en \( \left.)_{2} \mathrm{Br} 2\right] \) have optical isomers? A) cis only B) trans only C) both cis and trans D) neither cis nor trans E) \( \left[\mathrm{Mn}(\mathrm{en})_{2} \mathrm{Br}_{2}\right] \) does not exhibit cis-trans isomerism. 9. Based on electron configuration, which is most likely colorless? A) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) B) \( \left[\mathrm{Cd}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) C) \( \left[\mathrm{Ni}_{2}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \) D) \( \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}^{2+}\right. \) E) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+} \) 10. A result of the common-ion effect is A) that some ions, such as \( \mathrm{Na}^{+}(\mathrm{aq}) \), frequently appear in solutions but do not participate in solubility equilibria B) that common ions, such as \( \mathrm{Na}^{+} \)(aq), don't affect equilibrium constants C) that the selective precipitation of a metal ion, such as \( \mathrm{Ag}^{+} \), is promoted by the addition of an appropriate counterion \( \left(\mathrm{X}^{-}\right) \)that produces a compound \( (\mathrm{AgX}) \) with a very low solubility D) that ions such as \( \mathrm{K}^{+} \)and \( \mathrm{Na}^{+} \)are common ions, so that their values in equilibrium constant expressions are always \( 1.00 \) E) that common ions precipitate all counter-ions. 11. Which one of the following substances has three unpaired d electrons? A) \( \left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) B) \( \left[\mathrm{V}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{4+} \) C) \( \left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+} \) D) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \) E) \( \left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-} \) 12. The attraction of a metal to a neutral ligand is due to bonding. A) ionic B) covalent C) ion-dipole D) dipole-dipole E) hydrophobic