Q. In which type of reaction does hydrogen typically act as a reducing agent?
-
A.
Decomposition
-
B.
Synthesis
-
C.
Redox
-
D.
Neutralization
Solution
In redox reactions, hydrogen can act as a reducing agent by donating electrons.
Correct Answer:
C
— Redox
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Q. What is the most common oxidation state of hydrogen in compounds?
Solution
Hydrogen typically exhibits a +1 oxidation state when bonded to nonmetals.
Correct Answer:
C
— +1
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Q. What is the pH of a neutral solution at 25°C?
Solution
A neutral solution has a pH of 7 at 25°C.
Correct Answer:
B
— 7
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Q. What is the primary product when hydrogen reacts with oxygen?
-
A.
Water
-
B.
Hydrogen peroxide
-
C.
Ozone
-
D.
Hydrochloric acid
Solution
The primary product of the reaction between hydrogen and oxygen is water (H2O).
Correct Answer:
A
— Water
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Q. What is the primary reason hydrogen is placed in group 1 of the periodic table?
-
A.
It has one electron in its outer shell
-
B.
It is a gas at room temperature
-
C.
It forms diatomic molecules
-
D.
It is highly reactive
Solution
Hydrogen has one electron in its outer shell, similar to alkali metals.
Correct Answer:
A
— It has one electron in its outer shell
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Q. What type of bond is formed between hydrogen and chlorine in HCl?
-
A.
Ionic bond
-
B.
Covalent bond
-
C.
Metallic bond
-
D.
Hydrogen bond
Solution
The bond between hydrogen and chlorine in HCl is a covalent bond.
Correct Answer:
B
— Covalent bond
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Q. Which of the following compounds contains hydrogen in the -1 oxidation state?
-
A.
HCl
-
B.
NaH
-
C.
H2O
-
D.
NH3
Solution
In sodium hydride (NaH), hydrogen has an oxidation state of -1.
Correct Answer:
B
— NaH
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Q. Which of the following is a characteristic of hydrogen bonding?
-
A.
It occurs between two hydrogen atoms
-
B.
It is a type of ionic bond
-
C.
It involves hydrogen and highly electronegative atoms
-
D.
It is stronger than covalent bonds
Solution
Hydrogen bonding occurs when hydrogen is covalently bonded to highly electronegative atoms like oxygen or nitrogen.
Correct Answer:
C
— It involves hydrogen and highly electronegative atoms
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Q. Which of the following is a property of hydrogen gas?
-
A.
It is colorless and odorless
-
B.
It is heavier than air
-
C.
It is non-flammable
-
D.
It dissolves well in water
Solution
Hydrogen gas is colorless and odorless.
Correct Answer:
A
— It is colorless and odorless
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Q. Which of the following statements about hydrogen is true?
-
A.
It is the most abundant element in the universe
-
B.
It is a metal at room temperature
-
C.
It has a higher electronegativity than oxygen
-
D.
It can form cationic complexes only
Solution
Hydrogen is the most abundant element in the universe.
Correct Answer:
A
— It is the most abundant element in the universe
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