Hydrogen and its Compounds - Numerical Applications
Q. What is the bond angle in the H2O molecule?
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A.
90 degrees
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B.
104.5 degrees
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C.
120 degrees
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D.
180 degrees
Solution
The bond angle in H2O is approximately 104.5 degrees due to the bent shape of the molecule caused by the two lone pairs on the oxygen atom.
Correct Answer: B — 104.5 degrees
Q. What is the formula for the compound formed between hydrogen and sulfur?
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A.
H2S
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B.
HS
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C.
H2SO4
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D.
H2SO3
Solution
The formula for the compound formed between hydrogen and sulfur is H2S (hydrogen sulfide).
Correct Answer: A — H2S
Q. What is the molecular formula of the compound formed when hydrogen reacts with chlorine?
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A.
HCl
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B.
H2Cl2
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C.
Cl2H2
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D.
H3Cl
Solution
The molecular formula of the compound formed when hydrogen reacts with chlorine is HCl (hydrochloric acid).
Correct Answer: A — HCl
Q. What is the oxidation state of hydrogen in NaH?
Solution
In sodium hydride (NaH), hydrogen has an oxidation state of -1 because it is bonded to a metal.
Correct Answer: A — -1
Q. What is the standard reduction potential for the half-reaction H2 → 2H+ + 2e-?
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A.
0.00 V
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B.
0.76 V
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C.
1.23 V
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D.
2.00 V
Solution
The standard reduction potential for the half-reaction H2 → 2H+ + 2e- is defined as 0.00 V.
Correct Answer: A — 0.00 V
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