Hydrogen and its Compounds - Higher Difficulty Problems
Q. In which of the following coordination compounds does hydrogen act as a ligand?
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A.
[Fe(H2O)6]2+
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B.
[Cu(NH3)4]2+
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C.
[CoCl4]2-
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D.
[Ag(CN)2]-
Solution
In the complex [Fe(H2O)6]2+, water (H2O) acts as a ligand, coordinating with the iron ion.
Correct Answer: A — [Fe(H2O)6]2+
Q. What is the main reason for the low boiling point of hydrogen compared to other group 1 hydrides?
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A.
Hydrogen forms stronger bonds
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B.
Hydrogen has a lower molecular weight
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C.
Hydrogen does not form hydrogen bonds
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D.
Hydrogen is a gas at room temperature
Solution
Hydrogen does not form hydrogen bonds like heavier group 1 hydrides, leading to a lower boiling point.
Correct Answer: C — Hydrogen does not form hydrogen bonds
Q. What is the oxidation state of hydrogen in the hydride ion (H-)?
Solution
In the hydride ion (H-), hydrogen has an oxidation state of -1.
Correct Answer: C — -1
Q. What is the primary reason for the high electronegativity of hydrogen compared to alkali metals?
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A.
It has a full outer shell
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B.
It has a small atomic radius
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C.
It can form multiple bonds
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D.
It is a non-metal
Solution
Hydrogen has a small atomic radius, which allows it to attract electrons more effectively than larger alkali metals.
Correct Answer: B — It has a small atomic radius
Q. Which of the following compounds is a strong acid derived from hydrogen?
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A.
HCl
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B.
H2O
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C.
NH3
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D.
CH4
Solution
Hydrochloric acid (HCl) is a strong acid, while water (H2O), ammonia (NH3), and methane (CH4) are not.
Correct Answer: A — HCl
Q. Which of the following hydrogen compounds is most likely to act as a Lewis acid?
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A.
H2O
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B.
HCl
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C.
B2H6
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D.
NH3
Solution
Boron hydride (B2H6) can accept electron pairs, making it a Lewis acid.
Correct Answer: C — B2H6
Q. Which of the following is a characteristic of hydrogen peroxide (H2O2)?
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A.
It is a strong acid
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B.
It acts as a reducing agent
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C.
It is a stable compound
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D.
It contains a single bond between oxygen atoms
Solution
Hydrogen peroxide (H2O2) can act as a reducing agent due to its ability to donate electrons.
Correct Answer: B — It acts as a reducing agent
Q. Which of the following reactions is an example of a redox reaction involving hydrogen?
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A.
H2 + O2 → H2O
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B.
HCl + NaOH → NaCl + H2O
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C.
H2 + Cl2 → 2HCl
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D.
H2 + CO2 → H2O + C
Solution
The reaction H2 + O2 → H2O involves the oxidation of hydrogen and reduction of oxygen, making it a redox reaction.
Correct Answer: A — H2 + O2 → H2O
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