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| 1 | |
What is the electron configuration of a Cr atom? |
| | A) | [Ar]4s24d4 |
| | B) | [Ar]4s23d4 |
| | C) | [Ar]4s14d5 |
| | D) | [Ar]4s23d5 |
| | E) | none of the above |
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| 2 | |
What is the electron configuration of a Ni2+ ion? |
| | A) | [Ar]4s23d8 |
| | B) | [Ar]4s23d6 |
| | C) | [Ar]3d8 |
| | D) | [Ar]3d6 |
| | E) | none of the above |
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| 3 | |
Which, if any, of the following elements is not involved in human physiology as part of an enzyme or an enzymatic system? |
| | A) | manganese |
| | B) | iron |
| | C) | copper |
| | D) | zinc |
| | E) | They all form part of such systems. |
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| 4 | |
The density of gold is 19.3 g/cm3 at 20°C, and its atomic mass is 197.0 How many atoms are in a cube of pure gold whose sides are 1.50 cm at 20°C? |
| | A) | 1.99 ´ 1023 |
| | B) | 8.82 ´ 1022 |
| | C) | 6.14 ´ 1022 |
| | D) | 2.03 ´ 1024 |
| | E) | 1.16 ´ 1024 |
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| 5 | |
Xenon is element number 54, neodymium (Nd) is element number 60. Given that Nd has no 5d electrons, how many unpaired electrons are in the Nd atom? |
| | A) | 0 |
| | B) | 1 |
| | C) | 2 |
| | D) | 3 |
| | E) | 4 |
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| 6 | |
Which of the following statements about lanthanides and actinides is incorrect? |
| | A) | The +3 oxidation state is the most common for both lanthanides and actinides. |
| | B) | All of the actinide elements are radioactive. |
| | C) | All of the lanthanide elements occur in nature. |
| | D) | All of the actinide elements are artificially made. |
| | E) | Due to similarities in their chemical properties, the actinide elements are not easily separated from each other. |
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| 7 | |
Select the incorrect statement about the silver bromide photographic process for making a black-and-white negative. If there are no incorrect statements, select statement E. |
| | A) | Hydroquinone is oxidized in the development stage. |
| | B) | Unreacted Ag+ is removed by complexation with thiosulfate ion. |
| | C) | The latent image is invisible. |
| | D) | The black regions contain very small particles of elemental silver. |
| | E) | All of the above statements are correct. |
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| 8 | |
What are the coordination number (C.N.) and oxidation number (O.N.) of chromium in the complex ion [Cr(NH3)2(NO2)4]-? |
| | A) | C.N. = 6; O.N. = +4 |
| | B) | C.N. = 6; O.N. = +3 |
| | C) | C.N. = 5; O.N. = +2 |
| | D) | C.N. = 4; O.N. = +3 |
| | E) | C.N. = 4; O.N. = +4 |
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| 9 | |
Consider the tetrahedral geometry of the complex ion [MnCl4]2-. Which of the following statements about this ion is correct? |
| | A) | Any plane that contains two chlorine nuclei divides the ion into two mirror-image halves. |
| | B) | Manganese is in the +6 oxidation state. |
| | C) | There is a plane, that contains the manganese nucleus, that divides the ion into two mirror-image halves. |
| | D) | Manganese has a coordination number of 6. |
| | E) | There is an axis that passes through a chlorine nucleus, around which a 180° rotation produces a structure identical to the structure before rotation. |
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| 10 | |
Consider the hexaamminechromium(III) ion. Which of the following statements about the ion is incorrect? |
| | A) | Each NH3 ligand donates an electron pair to a Lewis acid to form the ion. |
| | B) | Each nitrogen in the ion has an unshared lone pair of electrons. |
| | C) | Each Cr-N bond is a coordinate covalent bond. |
| | D) | There are unpaired electrons present in this ion. |
| | E) | Each ligand is a Lewis base. |
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| 11 | |
What is the correct formula for diamminedichloroethylenediaminecobalt(III) bromide? |
| | A) | [CoCl2(en)(NH3)2]Br2 |
| | B) | [CoCl2(en)2(NH3)2]Br |
| | C) | [CoCl(en)(NH3)2]Br |
| | D) | [CoCl2(en)(NH3)2]Br |
| | E) | [CoCl2(en)2(NH3)2]Br2 |
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| 12 | |
How many isomers are possible for the complex ion [Cr(NH3)(OH)2Cl3]2-? |
| | A) | 5 |
| | B) | 4 |
| | C) | 3 |
| | D) | 2 |
| | E) | 1 |
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| 13 | |
Which of the following ions is least likely to form colored compounds? |
| | A) | Mn2+ |
| | B) | Fe3+ |
| | C) | Sc3+ |
| | D) | Cr3+ |
| | E) | Cu2+ |
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| 14 | |
Which of the following octahedral complexes should have the largest crystal field splitting energy, D? |
| | A) | [Cr(NH3)]3+ |
| | B) | [Cr(SCN)6]3- |
| | C) | [Cr(H2O)]3+ |
| | D) | [Cr(CN)6]3- |
| | E) | [CrCl6]3- |
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| 15 | |
The CN- ion is a strong field ligand whereas Cl- is usually a weak field ligand. Which of the following octahedral complexes has no unpaired electrons? |
| | A) | NiCl64- |
| | B) | Fe(CN)64- |
| | C) | FeF64- |
| | D) | CuCl64- |
| | E) | Fe(CN)63- |
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