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1 | |
What is the electron configuration of a Cr atom?
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| | 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?
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| | 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?
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| | A) | manganese
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| | B) | iron
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| | C) | copper
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| | D) | zinc
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| | 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?
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| | 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?
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| | A) | 0
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| | B) | 1
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| | C) | 2
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| | D) | 3
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| | E) | 4
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6 | |
Which of the following statements about lanthanides and actinides is incorrect?
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| | A) | The +3 oxidation state is the most common for both lanthanides and actinides.
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| | B) | All of the actinide elements are radioactive.
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| | C) | All of the lanthanide elements occur in nature.
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| | D) | All of the actinide elements are artificially made.
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| | 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.
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| | A) | Hydroquinone is oxidized in the development stage.
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| | B) | Unreacted Ag+ is removed by complexation with thiosulfate ion.
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| | C) | The latent image is invisible.
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| | D) | The black regions contain very small particles of elemental silver.
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| | 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?
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| | A) | Any plane that contains two chlorine nuclei divides the ion into two mirror-image halves.
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| | B) | Manganese is in the +6 oxidation state.
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| | C) | There is a plane, that contains the manganese nucleus, that divides the ion into two mirror-image halves.
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| | D) | Manganese has a coordination number of 6.
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| | 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?
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| | A) | Each NH3 ligand donates an electron pair to a Lewis acid to form the ion.
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| | B) | Each nitrogen in the ion has an unshared lone pair of electrons.
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| | C) | Each Cr-N bond is a coordinate covalent bond.
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| | D) | There are unpaired electrons present in this ion.
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| | E) | Each ligand is a Lewis base.
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11 | |
What is the correct formula for diamminedichloroethylenediaminecobalt(III) bromide?
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| | A) | [CoCl2(en)(NH3)2]Br2 |
| | B) | [CoCl2(en)2(NH3)2]Br
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| | C) | [CoCl(en)(NH3)2]Br
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| | D) | [CoCl2(en)(NH3)2]Br
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| | 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-?
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| | A) | 5
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| | B) | 4
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| | C) | 3
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| | D) | 2
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| | E) | 1
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13 | |
Which of the following ions is least likely to form colored compounds?
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| | 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?
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| | A) | NiCl64- |
| | B) | Fe(CN)64- |
| | C) | FeF64- |
| | D) | CuCl64- |
| | E) | Fe(CN)63- |
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