Assessment Exam: Inorganic
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What is the ground-state valence electron configuration of a Cu
2+
ion?
A. 4s
2
3d
7
B. 4s
2
3d
9
C. 4s
1
3d
10
D. 3d
9
Which of these isolated atoms or ions is diamagnetic?
A. Ag
+
B. C
C. S
D. V
3+
Which contains the shortest N-O bond?
A. NO
+
B. NO
C. NO
-
D. NO
2-
Which two techniques might best be used to determine the energy of the stretching vibration in CN
-
and the bond angle in OF
2
(g) respectively?
A. IR and electron diffraction
B. IR and NMR
C. NMR and electron diffraction
D. NMR and UV-visible spectroscopy
The relative extent of metal to ligand p back-bonding in metal carbonyls can be monitored by
A. electron spin resonance spectroscopy
B.
1
H NMR spectroscopy
C. magnetic susceptibility
D. infrared spectroscopy
Considering the thermodynamic steps in the Born-Haber cycle for the formation of Al
2
O
3
from the elements, the factor most responsible for the stability of this salt is the
A. bond energy of O
2
B. exothermic electron affinities for oxygen
C. ionization energies for aluminum
D. lattice energy
The addition of trace amounts of gallium to very pure crystalline silicon produces a material that is
A. a high-temperature superconductor
B. a metallic conductor
C. an n-type semiconductor
D. a p-type semiconductor
Consider this reaction: TlBr + LiF = TlF + LiBr
Which is the correct prediction and explanation about the equilibrium constant, K, for this reaction?
A. K>1, because Br is a harder base than F
B. K>1, because F is a harder base than Br
C. K<1, because Br is a harder base than F
D. K<1, because F is a harder base than Br
How does the oxidation state of Ir formally change in this reaction?
trans-IrClCO(P(C
6
H
5
)
3
)
2
+ H
2
-> IrClCO(P(C
6
H
5
)
3
)
2
H
2
A. from +1 to -1
B. from 0 to +2
C. from +1 to +3
D. no change
Ignoring possible ring conformation effects, what is the total number of geometric and optical isomers for [Co(en)
2
Br
2
]
+
? Note: en=[H
2
NCH
2
CH
2
NH
2
]
A. 1
B. 2
C. 3
D. 4
Which complex has the largest ligand field stabilization energy?
A. [Ti(OH
2
)
6
]
3+
B. [V(OH
2
)
6
]
3+
C. [Cr(OH
2
)
6
]
3+
D. [Mn(OH
2
)
6
]
2+
[NiCl
2
(PPh
3
)
2
] has a magnetic moment of 2.96 BM whereas [PtCl
2
(PPh
3
)
2
] is diamagnetic. This demonstrates that
A. both compounds are square planar
B. both compounds are tetrahedral
C. [NiCl
2
(PPh
3
)
2
] is square planar and [PtCl
2
(PPh
3
)
2
] is tetrahedral
D. [PtCl
2
(PPh
3
)
2
] is square planar and [NiCl
2
(PPh
3
)
2
] is tetrahedral
In spite of the high equilibrium constant (K=10
25
) for the reaction given here, the reaction proceeds very slowly, reaching equilibrium only after several days at room temperature. [Co(NH
3
)
6
]
3+
+ 6 H
3
O
+
= [Co(H
2
O)
6
]
3+
+ 6 NH
4
+
This observation is consistent with
A. the activation energy for the forward reaction being low
B. the classification of [Co(NH
3
)
6
]
3+
as an inert complex
C. [Co(NH
3
)
6
]
3+
being more labile than [Co(H
2
O)
6
]
3+
D. [Co(NH
3
)
6
]
3+
being unstable in strong acid
The major reason that [Ni(H
2
NCH
2
CH
2
NH
2
)
3
]
2+
is thermodynamically more stable than [Ni(NH3)6]2+ is the
A. chelate effect
B. greater Lewis basicity of H
2
NCH
2
CH
2
NH
2
compared to two NH3 ligands
C. macrocyclic effect
D. relative rates of their formation
Which is an acidic oxide?
A. B
2
O
3
B. BaO
C. MgO
D. Na2O
What are the main products of a reaction of Si(s) with excess Cl
2
(g) and of Pb(s) with excess Cl2(g) at room temperature?
A. SiCl
2
and PbCl
2
B. SiCl
2
and PbCl
4
C. SiCl
4
and PbCl
2
D. SiCl
4
and PbCl
4
Which is the point group of the molecule AsH
3
?
A. C
3
B. C
3v
C. C
3h
D. D
3h
Which is the lowest energy free-ion spectroscopic state for a d
2
electron configuration?
A.
1
D
B.
1
S
C.
3
F
D.
3
P