chemistry : class12 Fajan’s Rule : Ionic solids : Solid State MCQ Questions and Answers
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Fajan’s Rule
MCQ questions and answers.
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MCQ Questions
1. According to Fajan’s rule, which cation has the greatest polarising power?
A.
Na+
B.
K+
C.
Mg2+
D.
Ca2+
Correct Answer:
Mg2+
Explanation:
Mg2+ has a higher charge and smaller size than the other listed cations, so it has the greatest polarising power.
2. According to Fajan’s rule, which anion is most easily polarised?
A.
F−
B.
Cl−
C.
Br−
D.
I−
Correct Answer:
I−
Explanation:
I− is the largest anion in the group, so its electron cloud is most easily distorted or polarised.
3. A compound will have greater covalent character when its cation is:
A.
Large and singly charged
B.
Small and highly charged
C.
Large and highly charged
D.
Small and singly charged
Correct Answer:
Small and highly charged
Explanation:
A small, highly charged cation has high polarising power and distorts the electron cloud of the anion more strongly, increasing covalent character.
4. Which compound is expected to have the greatest covalent character?
A.
LiF
B.
LiCl
C.
LiBr
D.
LiI
Correct Answer:
LiI
Explanation:
All compounds contain the small Li+ cation, but I− is the largest and most polarizable anion. Therefore, LiI has the greatest covalent character.
5. Which cation has greater polarising power, assuming the cations have the same charge?
A.
Na+
B.
K+
C.
Rb+
D.
Cs+
Correct Answer:
Na+
Explanation:
For cations with the same charge, the smaller cation has greater polarising power. Na+ is the smallest among the given cations.
6. Which compound is expected to be more covalent according to Fajan’s rule?
A.
NaCl
B.
MgCl2
C.
KCl
D.
CaCl2
Correct Answer:
MgCl2
Explanation:
Mg2+ is small and has a higher charge than the other relevant cations, giving it greater polarising power and making MgCl2 more covalent.
7. The polarising power of a cation increases when its:
A.
Size increases and charge decreases
B.
Size decreases and charge increases
C.
Size and charge both decrease
D.
Size and charge both increase
Correct Answer:
Size decreases and charge increases
Explanation:
A smaller cation with a higher positive charge has a stronger electric field and can distort an anion more effectively.
8. The polarizability of an anion generally increases with:
A.
Decrease in size
B.
Increase in size
C.
Decrease in negative charge only
D.
Increase in nuclear charge only
Correct Answer:
Increase in size
Explanation:
Larger anions have more diffuse and loosely held electron clouds, which are more easily distorted.
9. Which chloride is expected to have the greatest covalent character?
A.
LiCl
B.
NaCl
C.
KCl
D.
CsCl
Correct Answer:
LiCl
Explanation:
Li+ is the smallest cation among the options and therefore has the greatest polarising power toward the Cl− ion.
10. According to Fajan’s rule, covalent character is generally increased by:
A.
A large cation and a small anion
B.
A small cation and a large anion
C.
A large cation and a large anion only
D.
A small cation and a small anion only
Correct Answer:
A small cation and a large anion
Explanation:
A small cation strongly polarises the electron cloud, while a large anion is easily polarised. Together, they increase covalent character.
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