Question:
Which of the following compounds has highest lattice energy?
Which of the following compounds has highest lattice energy?
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For the same anion, lattice energy is highest for the smallest cation.
Updated On: Nov 13, 2026
CsF
KF
NaF
RbF
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Lattice energy \(\propto\dfrac{q_+q_-}{r_++r_-}\). Charges are the same, so a smaller ionic radius gives higher lattice energy.
Step 2: Cation sizes
\(\text{Na}^+<\text{K}^+<\text{Rb}^+<\text{Cs}^+\).
Step 3: Result
NaF has the smallest cation and so the highest lattice energy.
Final Answer:
NaF has the highest lattice energy. \[ \boxed{\text{(C) }\text{NaF}} \]
Lattice energy \(\propto\dfrac{q_+q_-}{r_++r_-}\). Charges are the same, so a smaller ionic radius gives higher lattice energy.
Step 2: Cation sizes
\(\text{Na}^+<\text{K}^+<\text{Rb}^+<\text{Cs}^+\).
Step 3: Result
NaF has the smallest cation and so the highest lattice energy.
Final Answer:
NaF has the highest lattice energy. \[ \boxed{\text{(C) }\text{NaF}} \]
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