chemistry : class12 Electrostatic Forces : Ionic solids : Solid State MCQ Questions and Answers
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Electrostatic Forces
MCQ questions and answers.
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MCQ Questions
1. What type of force holds Na+ and Cl− ions together in sodium chloride?
A.
Electrostatic attraction
B.
Covalent attraction
C.
Metallic attraction
D.
Gravitational attraction
Correct Answer:
Electrostatic attraction
Explanation:
Na+ and Cl− have opposite charges, so they attract each other through electrostatic forces.
2. Which pair of ions experiences electrostatic attraction?
A.
Na+ and Cl−
B.
Na+ and K+
C.
Cl− and Br−
D.
Mg2+ and Ca2+
Correct Answer:
Na+ and Cl−
Explanation:
Oppositely charged ions attract electrostatically, whereas ions with like charges repel each other.
3. According to Coulomb’s law, the electrostatic force between two ions increases when their charges
A.
Increase in magnitude
B.
Become zero
C.
Become equal in sign only
D.
Are placed farther apart
Correct Answer:
Increase in magnitude
Explanation:
The electrostatic force is directly proportional to the product of the magnitudes of the ionic charges.
4. What happens to the electrostatic attraction between two oppositely charged ions when the distance between them increases?
A.
It decreases
B.
It increases
C.
It becomes infinite
D.
It remains unchanged
Correct Answer:
It decreases
Explanation:
By Coulomb’s law, electrostatic force decreases as the distance between charged particles increases.
5. Which ion pair has the strongest electrostatic attraction when the distance between the ions is similar?
A.
Na+ and Cl−
B.
K+ and Br−
C.
Mg2+ and O2−
D.
Li+ and F−
Correct Answer:
Mg2+ and O2−
Explanation:
Mg2+ and O2− have greater charge magnitudes than singly charged ions, producing a stronger electrostatic attraction at a similar distance.
6. The electrostatic force between two ions depends mainly on their charges and their
A.
Distance from each other
B.
Colour
C.
Melting point
D.
Crystal name
Correct Answer:
Distance from each other
Explanation:
Coulomb’s law shows that electrostatic force depends on the ionic charges and the distance separating them.
7. What is the electrostatic interaction between two chloride ions, Cl− and Cl−?
A.
Attraction
B.
Repulsion
C.
No force
D.
Covalent bonding
Correct Answer:
Repulsion
Explanation:
Both chloride ions have negative charges, so like charges repel each other through electrostatic forces.
8. Why do positive and negative ions remain arranged together in an ionic crystal?
A.
Opposite charges attract each other
B.
Like charges attract each other
C.
The ions have no electric charges
D.
The ions are held by gravity alone
Correct Answer:
Opposite charges attract each other
Explanation:
The regular arrangement of an ionic crystal is stabilized by electrostatic attraction between oppositely charged neighboring ions.
9. If the charge on one ion is doubled while the distance remains constant, the electrostatic force between the ions becomes
A.
Twice as large
B.
Half as large
C.
Unchanged
D.
Zero
Correct Answer:
Twice as large
Explanation:
According to Coulomb’s law, the force is directly proportional to the charge on either ion when the other factors remain constant.
10. Which statement about electrostatic forces in ionic solids is correct?
A.
They act between oppositely charged ions
B.
They act only between neutral atoms
C.
They are independent of ionic charge
D.
They always cause like charges to attract
Correct Answer:
They act between oppositely charged ions
Explanation:
Electrostatic attraction in ionic solids occurs between positively and negatively charged ions.
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