Covalent Bonding (Concept of Electronegativity. Fajan’s Rule, Dipole Moment) NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Covalent Bonding (Concept of Electronegativity. Fajan’s Rule, Dipole Moment) MCQ Questions


1.
Electronegativity of an element is defined as:
A.
The energy released when an electron is added to a gaseous atom
B.
The tendency of an atom in a molecule to attract the shared pair of electrons towards itself
C.
The energy released when a bond is formed between two atoms
D.
The energy required to remove an electron from a gaseous atom
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ANSWER :
B. The tendency of an atom in a molecule to attract the shared pair of electrons towards itself
2.
Which of the following elements has the highest electronegativity?
A.
Oxygen
B.
Nitrogen
C.
Chlorine
D.
Fluorine
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ANSWER :
D. Fluorine
3.
How does electronegativity differ from electron gain enthalpy?
A.
Electron gain enthalpy applies to bonded atoms while electronegativity applies to isolated atoms
B.
They are exactly the same property
C.
Electronegativity is the property of a bonded atom while electron gain enthalpy is the property of an isolated atom
D.
Electronegativity has units while electron gain enthalpy is dimensionless
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ANSWER :
C. Electronegativity is the property of a bonded atom while electron gain enthalpy is the property of an isolated atom
4.
Which scale is most commonly used to measure electronegativity?
A.
Mulliken scale
B.
Allred-Rochow scale
C.
Pauling scale
D.
Sanderson scale
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ANSWER :
C. Pauling scale
5.
On moving across a period in the periodic table from left to right, electronegativity:
A.
Remains constant
B.
First increases then decreases
C.
Decreases
D.
Increases
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ANSWER :
D. Increases
6.
On moving down a group in the periodic table, electronegativity:
A.
Remains constant
B.
Increases
C.
Becomes zero
D.
Decreases
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ANSWER :
D. Decreases