Multiple choice problems in general chemistry.

Multiple choice problems on various aspects of general chemistry.

1. Which of the following statements concerning the complex ion Co(en)2Cl2+ ion is true? (en = ethylenediamine, NH2CH2CH2NH2)

i.Since en is a strong field ligand
ii.The geometric isomers of the complex ion have identical chemical properties.
iii.The complex ion exhibits two geometric isomers (cis and trans) and two optical isomers.
iv.The complex ion contains Co(I).
v.The complex ion exhibits cis and trans geometric isomers but no optical isomers

2.Which of the following elements has the largest known oxidation number (in magnitude)?
i.Pt
ii.Au
iii.Ru
iv.Fe
v.Os

3.Farmers like to rotate crops. Which of the following crops in rotation would fixate nitrogen from the atmosphere? Circle ALL THAT APPLY.
a. Peanuts Peas
b. Corn
c. Wheat
d. Beans
e. Carrots

4. What is the reason for the stability of C-C, N-N, and O-O bonds compared to Si-Si, P-P, and S-S bonds?
a.Large differences in their ionization energies.
b.Large differences in their abilities to form strong pi bonds.
c.Large differences in their electro negativities.
d.Their metallic character varies greatly.
e.None of the above

5. With which of the following elements does silicon form the strongest bonds?
a.C
b.H
c.Si
d.B
e.O

6. Which of the following is the best explanation as to why lithium is the strong reducing agent of the alkali metals?
a.The ionization energy of lithium is the highest of the alkali metals.
b.The standard reduction potential of LI is the most positive of the alkali metals.
c.The ionizationn energy of lithium is the lowest of the alkali metals.
d.The relatively high charge density of Li comparied to the other alkali metals
e.None of the above

7. Which of the following elements is likely to have the highest concentration inside a human cell?
a.Li
b.Na
c.Rb
d.Cs
e.K

8. Which group contains two elements that exhibit +2 and +4 oxidation states?
a.1A
b.2A
c.3A
d.4A
e.5A
f.6A
g.7A

9. Which group from the given list: a) 1A b) 2A c) 3A d) 4A e) 5A This group contains two of the most important element found on earth.
a.a
b.b
c.c
d.d
e.e

10. What is the Lewis electron dot structure for the hydride ion?
a.H+
b.H3O+
c.H:-
d.H•
e.None of the above

11. Classify each of the following hydrides or oxides according to whether it is primarily ionic or covalent in character.
a.Water -Covalent
b.Na2O -Ionic
c.SiO2- Covalent
d.RaH2 - Ionic
e.Li2O -Ionic
f.P4O10 - Covalent
g.NH3 -Covalent
h.Methane -Covalent
i.LiH-Ionic
j.CO2 -Covalent

12. Ionic hybrids of type MH2 are most likely to form between hybrid and element of group:
a.A
b.B
c.D
d.E

13. Which element is obtained primarily from the distillation of liquid air?
a.Ar
b.P
c.He
d.Sb
e.N

14. The compound ammonium nitrate is sometimes used as a high explosive. Which of the reasons below might best describe this?
a.It contains ammonium ions.
b.It is extremely water soluble.
c.It is an excellent commercial fertilizer.
d.It contains nitrogen in both its highest and lowest oxidation states.
e.None of the above

15. Which of the following is paramagnetic?
a.Cu(CN)32-
b.Mn(CN)62- (strong field)
c.Zn(H2O)62+
d.Co(NH3)63+ (strong field)
e.None of the above

Specify the number of unpaired electrons for each of the species shown below.

a.CuCl2- (linear) -Nil
b.Ni(NH3)62+ -Nil
c.CoF63 - (weak field) -Nil
d.Co(en)33+ (strong field) (en = "ethylene diamine") -Nil
e.NiCl42 - (tetrahedral)
i.0
ii.1
iii.2
iv. 3
v.4
vi.5

16.Which element is most important for helping eyesight?
a.Se
b.S
c.As
d.Pu
e.Po

17.Which is the most reactive form of phosphorus?
a.Black
b.White
c.Red
d.All

18.The Curies discovered two elements. These were (select the two that apply)...
a.Li
b.Ra
c.Ca
d.Po
e.Na
f.Pa
g.Pd
h.Cu

19.Which of the following elements are semiconductors? CHECK ALL THAT APPLY
a.Ca
b.S
c.Si
d.Al
e.Ge
f.Po
g.Te
h.Ca