chemistry : class11 Electronegativity Difference : Polar character of covalent bond : Chemical Bonding and Molecular Structure MCQ Questions and Answers
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Electronegativity Difference
MCQ questions and answers.
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MCQ Questions
1. What does electronegativity difference between two bonded atoms indicate?
A.
The difference in their atomic masses
B.
The unequal attraction for shared electrons
C.
The number of neutrons in the atoms
D.
The total number of electron shells
Correct Answer:
The unequal attraction for shared electrons
Explanation:
Electronegativity difference measures how differently two bonded atoms attract the shared pair of electrons.
2. A covalent bond between two atoms with the same electronegativity has an electronegativity difference of:
A.
0
B.
1
C.
2
D.
The atomic number
Correct Answer:
0
Explanation:
When both atoms have the same electronegativity, their electronegativity difference is zero.
3. Which bond is expected to have the greatest polar character based on electronegativity difference?
A.
H–H
B.
Cl–Cl
C.
H–F
D.
Br–Br
Correct Answer:
H–F
Explanation:
Hydrogen and fluorine have a large electronegativity difference, so the H–F bond is strongly polar.
4. If the electronegativity difference between two bonded atoms increases, the polar character of the bond generally:
A.
Decreases
B.
Increases
C.
Becomes zero
D.
Remains exactly unchanged
Correct Answer:
Increases
Explanation:
A larger electronegativity difference causes greater unequal sharing of electrons and therefore greater bond polarity.
5. Which type of covalent bond generally forms when the electronegativity difference is very small?
A.
Nonpolar covalent bond
B.
Highly ionic bond
C.
Metallic bond
D.
Coordinate bond only
Correct Answer:
Nonpolar covalent bond
Explanation:
A very small electronegativity difference leads to nearly equal sharing of the bonding electrons.
6. Which pair of atoms has the smallest electronegativity difference?
A.
H and F
B.
Na and Cl
C.
Cl and Cl
D.
C and O
Correct Answer:
Cl and Cl
Explanation:
Identical chlorine atoms have equal electronegativities, so their electronegativity difference is zero.
7. In a polar covalent bond, the atom with higher electronegativity attracts the shared electrons:
A.
Less strongly
B.
More strongly
C.
Only after losing them
D.
With exactly the same strength as the other atom
Correct Answer:
More strongly
Explanation:
The atom with higher electronegativity pulls the shared electron pair closer to itself.
8. Which bond is more polar based on electronegativity difference?
A.
C–H
B.
C–F
C.
C–C
D.
H–H
Correct Answer:
C–F
Explanation:
The electronegativity difference between carbon and fluorine is greater than that in the other listed bonds, making C–F more polar.
9. If two atoms have identical electronegativity values, the shared electron pair is:
A.
Attracted equally by both atoms
B.
Attracted only by the larger atom
C.
Transferred completely to one atom
D.
Not present in the bond
Correct Answer:
Attracted equally by both atoms
Explanation:
Identical electronegativities give an electronegativity difference of zero, so both atoms attract the shared pair equally.
10. Which bond has the largest electronegativity difference among the following?
A.
H–H
B.
C–C
C.
O–O
D.
H–Cl
Correct Answer:
H–Cl
Explanation:
Hydrogen and chlorine have different electronegativities, whereas each homonuclear bond has zero electronegativity difference.
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