chemistry : class11 Partial Positive Charge : Polar character of covalent bond : Chemical Bonding and Molecular Structure MCQ Questions and Answers
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Partial Positive Charge
MCQ questions and answers.
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MCQ Questions
1. In a polar covalent bond, the atom with lower electronegativity usually acquires which charge?
A.
Partial positive charge
B.
Partial negative charge
C.
Full positive charge
D.
No charge at all
Correct Answer:
Partial positive charge
Explanation:
The less electronegative atom attracts the shared electron pair less strongly and therefore develops a partial positive charge, represented by δ+.
2. In the H–Cl bond, which atom carries a partial positive charge?
A.
Hydrogen
B.
Chlorine
C.
Both atoms equally
D.
Neither atom
Correct Answer:
Hydrogen
Explanation:
Chlorine is more electronegative than hydrogen and attracts the shared electrons toward itself, leaving hydrogen with a partial positive charge.
3. The symbol δ+ is used to represent:
A.
A partial positive charge
B.
A partial negative charge
C.
A complete positive charge
D.
A complete negative charge
Correct Answer:
A partial positive charge
Explanation:
The symbol δ+ indicates that an atom has a slight positive charge due to unequal sharing of electrons in a covalent bond.
4. In the H–F bond, which atom has a partial positive charge?
A.
Hydrogen
B.
Fluorine
C.
Both hydrogen and fluorine
D.
Neither hydrogen nor fluorine
Correct Answer:
Hydrogen
Explanation:
Fluorine is more electronegative than hydrogen, so the shared electrons are attracted toward fluorine and hydrogen becomes partially positive.
5. A partial positive charge develops on an atom when the shared electrons are:
A.
Attracted more strongly by the other atom
B.
Transferred completely to that atom
C.
Equally shared by both atoms
D.
Removed from both atoms
Correct Answer:
Attracted more strongly by the other atom
Explanation:
When the other atom attracts the bonding electrons more strongly, the first atom has reduced electron density and develops a partial positive charge.
6. In a covalent bond between carbon and hydrogen, carbon is slightly more electronegative. Which atom is more likely to carry δ+?
A.
Hydrogen
B.
Carbon
C.
Both carbon and hydrogen equally
D.
Neither carbon nor hydrogen
Correct Answer:
Hydrogen
Explanation:
Carbon attracts the shared electrons slightly more strongly than hydrogen, so hydrogen has a partial positive charge.
7. Which notation correctly shows a partial positive charge on hydrogen in H–Cl?
A.
Hδ+–Cl
B.
H–Clδ+
C.
H+–Cl−
D.
H−–Cl+
Correct Answer:
Hδ+–Cl
Explanation:
Hydrogen is less electronegative than chlorine and therefore carries a partial, not complete, positive charge shown as Hδ+.
8. A partial positive charge on an atom in a covalent bond indicates that the atom has:
A.
Lower electron density than the other bonded atom
B.
More electrons than the other bonded atom
C.
Completely lost all its electrons
D.
Gained a complete negative charge
Correct Answer:
Lower electron density than the other bonded atom
Explanation:
Unequal sharing of bonding electrons gives the less electronegative atom lower electron density and a partial positive charge.
9. In the O–H bond, oxygen is more electronegative than hydrogen. What charge does hydrogen acquire?
A.
Partial positive charge
B.
Partial negative charge
C.
Complete negative charge
D.
No charge because the bond is covalent
Correct Answer:
Partial positive charge
Explanation:
Oxygen pulls the shared electron pair toward itself, so hydrogen has less electron density and becomes partially positive.
10. Which factor most directly causes a partial positive charge in a polar covalent bond?
A.
Difference in electronegativity between the bonded atoms
B.
Equal electronegativity of the bonded atoms
C.
Formation of a metallic lattice
D.
Complete transfer of electrons
Correct Answer:
Difference in electronegativity between the bonded atoms
Explanation:
A difference in electronegativity causes unequal sharing of electrons, making the less electronegative atom partially positive.
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