21.Which of the following is true?
A)Both CO and CO2 are colorless, odorless gases.
B)Both CO and CO2 burn readily in oxygen.
C)Both CO and CO2 are toxic gases.
D)a and c
E)all of the above
22.Air is made up of approximately 75 to 80% of which of the following?
A) hydrogen B) nitrogen C) carbon D) oxygen E) helium
23.Which of the following elements is essential to life because it is a component of proteins and nucleic acids?
A) phosphorus B) sulfur C) chlorine D) bromine E) nitrogen
24.Nitric oxide, NO, is
A)a brown poisonous gas that is one of the chemicals involved in the production of photochemical smog.
B)produced in the atmosphere in a nitrogen fixation reaction.
C)a colorless gas used as a propellant in canned whipped cream.
D)a colorless gas that disproportionates into nitrogen and oxygen.
E)None of these choices is correct.
25.The nitrate anion is
A)a strong acid.D)a strong reducing agent.
B)a strong base.E)a strong oxidizing agent.
26.Which of the following is an accurate comparison of the properties of nitrogen and oxygen?
A)Both oxygen and nitrogen form anions easily.
B)Oxygen is a strong oxidizing agent while nitrogen is a strong reducing agent.
C)Nitrogen uses more oxidation states in its compounds than oxygen does.
D)Nitrogen is more reactive than oxygen.
E)Nitrogen does not form naturally-occurring compounds, but oxygen does.
27.Which of the following is a commercial application of phosphate compounds?
B)toothpasteE)All of the answers are correct.
28.Which one of these species exists as a diatomic element at room temperature?
A) Na B) N C) B D) Ar E) P
29.What is the charge on the monatomic ion of nitrogen, the nitride ion?
A) -3 B) +2 C) -1 D) -2 E) +1
30.Sulfur hexafluoride, SF6, is
A)a reactive gas that decomposes when exposed to moisture.
B)a reactive gas used to fluorinate organic compounds.
C)an inert gas that is used as an electrical insulator.
D)a reactant in the process of manufacturing non-stick coatings.
E)used in the manufacture of sulfuric acid.
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