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31) Choose the INCORRECT statement. A) One popular chelating agent is EDTA. B) [Cr(NH3)4Br]Cl and [Cr(NH3)4Cl]Br are examples of ionization isomerism. C) [Zn(NH3)4][CuCl4] is an example of coordination isomerism. D) A tetrahedral complex cannot have a geometric isomer. E) Enantiomers are structural isomers. 32) The compound PtCl2(en)2 [en = H2NCH2NH2] is octahedral; therefore we know that: A) en must be a monodentate ligand B) two moles of Cl- per mole of PtCl2(en)2 can be precipitated rapidly by the addition of Ag+ C) the molecule is nonpolar D) the compound can have cis and trans isomers E) Pt always has a coordination of 4 33) Choose the correct statement about isomers of [Pt(H2O)2(NH3)Cl]Br. A) I is cis, II is trans. B) The two molecules are the same. C) The two molecules are the same but one is turned over. D) They are not isomers. E) I is trans, II is cis. 34) When [Ni(NH3)4]2+ is treated with concentrated HCl, two compounds having the same formula, Ni(NH3)4Cl2, designated I and II, are formed. Compound I can be converted to compound II by boiling it in dilute HCl. A solution of I reacts with oxalic acid, H2C2O4, to form Ni(NH3)4(C2O4). Compound II does not react with oxalic acid. Compound II is: A) the cis isomer B) tetrahedral in shape C) the trans isomer D) the same as compound I E) octahedral in shape 35) Which of the following ligands exerts the strongest field? A) I- B) H2O C) ONO- D) NH3 E) Br- 36) Which complex ion possesses the largest number of unpaired electrons? A) CoCl42- B) Cr(NH3)62+ C) Cu(NH3)42+ D) Mn(CN)64- E) Fe(H2O)63+ 37) Which element possesses the smallest number of unpaired electrons? A) Co B) Cr C) Cu D) Mn E) Fe 38) Choose the correct shape, weak or strong field, and number of unpaired electrons for [Co(NH3)6]3+. A) square planar, strong, 6 B) square planar, weak, 0 C) tetrahedral, strong, 0 D) octahedral, strong, 0 E) octahedral, weak, 6 39) Choose the correct shape, weak or strong field, and number of unpaired electrons for [PtCl6]2-. A) square planar, weak, 0 B) square planar, strong, 4 C) tetrahedral, weak, 0 D) octahedral, weak, 1 E) octahedral, weak, 4 40) Choose the correct shape, weak or strong field, and number of unpaired electrons for [CoCl4]2-. A) square planar, strong, 3 B) square planar, strong, 0 C) tetrahedral, strong, 1 D) tetrahedral, weak, 3 E) square planar, weak, 0

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