Periodic Table and Periodicity
Q. What is the trend in ionization energy as you move across a period from left to right?
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A.
Increases
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B.
Decreases
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C.
Remains the same
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D.
Varies unpredictably
Solution
Ionization energy generally increases across a period due to increasing nuclear charge.
Correct Answer: A — Increases
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Q. Which acid is considered a strong acid in aqueous solution?
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A.
Acetic acid
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B.
Hydrochloric acid
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C.
Citric acid
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D.
Carbonic acid
Solution
Hydrochloric acid (HCl) is a strong acid that completely dissociates in water.
Correct Answer: B — Hydrochloric acid
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Q. Which element is most likely to form a cation with a +1 charge?
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A.
Magnesium
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B.
Potassium
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C.
Calcium
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D.
Aluminum
Solution
Potassium is an alkali metal and typically forms a +1 cation by losing one electron.
Correct Answer: B — Potassium
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Q. Which of the following compounds is a coordination compound?
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A.
NaCl
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B.
Cu(NH3)4SO4
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C.
H2O
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D.
CCl4
Solution
Cu(NH3)4SO4 is a coordination compound with a central metal ion surrounded by ligands.
Correct Answer: B — Cu(NH3)4SO4
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Q. Which of the following coordination compounds contains a bidentate ligand?
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A.
[Cu(NH3)4]2+
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B.
[Ni(C2O4)2]2-
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C.
[Fe(CN)6]3-
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D.
[Ag(NH3)2]+
Solution
Oxalate (C2O4) is a bidentate ligand that can form two bonds with a metal center.
Correct Answer: B — [Ni(C2O4)2]2-
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Q. Which of the following elements is most likely to form a +2 oxidation state?
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A.
Magnesium
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B.
Sodium
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C.
Potassium
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D.
Aluminum
Solution
Magnesium commonly forms a +2 oxidation state by losing two electrons.
Correct Answer: A — Magnesium
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Q. Which of the following is a characteristic of metals?
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A.
Brittle
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B.
Good conductors of heat
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C.
Dull appearance
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D.
Low density
Solution
Metals are typically good conductors of heat and electricity due to the presence of free-moving electrons.
Correct Answer: B — Good conductors of heat
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