NEET Chemistry: Fajan’s rule Practice Questions
15 free multiple-choice questions on Fajan’s rule (Chemical Bonding and Molecular Structure) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which type of anion generally exhibits a high polarizing power and is more likely to cause significant covalent character in the bond?
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Correct answer: B — Highly polarizable anions
Anions that are large and have low charge density are more polarizable and exert a stronger polarizing effect on the cation, leading to increased covalent character in the bond (Fajan's rule).
Q2. Which factor increases the tendency of a cation to act as a Lewis acid when interacting with an anion according to Fajan's rule?
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Correct answer: B — Increasing the polarizing ability of the anion
The polarizing ability of the anion directly influences the bond character. A higher polarizing ability increases the ability of the anion to withdraw electron density, which is related to the Lewis acidity of the cation.
Q3. In the context of Fajan's rule, a small cation tends to form bonds with anions that are:
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Correct answer: C — Small and highly charged
Small cations have a high charge density and strongly attract the electron density of the anion, favoring the formation of polar bonds.
Q4. According to Fajan's rule, the ability of a cation to distort the electron distribution of an anion is primarily dependent on the cation's:
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Correct answer: A — polarizing power
Fajan's rule states that the polarizing power of a cation is the ability of the cation to distort the electron cloud of the anion. This polarizing power is related to the cation's charge and size.
Q5. Which factor primarily determines the polarizing power of an anion according to Fajan's rule?
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Correct answer: C — Size of the anion
The polarizing power of an anion is primarily determined by its size and charge density. Larger ions with the same charge exhibit less polarizing power.
Q6. Which type of bond is generally expected in compounds formed by small, highly polarizing cations?
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Correct answer: C — Polar covalent
High polarizing power causes the electron cloud of the anion to be distorted, leading to a greater sharing of electrons, resulting in a polar covalent bond.
Q7. Which factor is most critical in applying Fajan's rule to predict the bond character in an ionic lattice?
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Correct answer: C — The relative size and polarizing power of the constituent ions
Fajan's rule focuses on the electronic interaction between the cation and anion, which is governed by their relative size and the resulting polarizing power.
Q8. If an anion has a large size and low charge, its polarizing effect on a cation will be:
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Correct answer: D — Low
Larger anions have lower charge density and thus exert weaker polarizing power on the cation.
Q9. Fajan's rule primarily relates the tendency of a cation to acquire a covalent character based on which property of the anion?
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Correct answer: A — The polarizing ability (polarizability) of the anion
Fajan's rule states that the polarizing ability (polarizability) of the anion is the key factor determining the degree of covalent character formed in the bond.
Q10. In an ionic compound, the degree of covalent character is increased when the cation has:
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Correct answer: B — Small size and high charge
A small size and high charge lead to a high charge density, which increases the polarizing power of the cation, thus increasing the covalent character of the bond according to Fajan's rule.
Q11. In the context of Fajan's rule, which pair of ions typically forms a highly ionic bond?
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Correct answer: A — A small cation and a small, non-polarizable anion
A highly ionic bond is expected when there is minimal polarization, which occurs when both ions are relatively small and non-polarizable, or when the polarizing power is low.
Q12. If an ionic compound exhibits a high degree of covalent character, it implies that the cation in the compound has:
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Correct answer: B — High polarizing power
High covalent character results when the cation strongly distorts the anion's electron cloud, which is directly related to high polarizing power.
Q13. In the context of Fajan's rule, a cation with a high polarizing power tends to cause which type of bond to be more covalent?
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Correct answer: A — Highly polarized covalent bond
A high polarizing power means the cation exerts a strong electrostatic force, distorting the electron cloud of the anion, which increases the covalent character of the bond.
Q14. Which of the following statements correctly describes the basis of Fajan's rule regarding bond character in ionic compounds?
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Correct answer: C — The polarization effect is governed by the relative size and charge density of the cation.
Fajan's rule states that the degree of covalent character in a bond is determined by the polarizing power of the cation, which depends on its charge and size. A smaller cation with a higher charge density exerts a greater polarizing effect on the anion's electron cloud, leading to more covalent character.
Q15. The ability of an anion to distort the electron distribution of a cation is known as:
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Correct answer: B — Polarizability
Polarizability is the measure of how easily the electron cloud of an ion can be distorted by an external electric field (i.e., the polarizing power).
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