Ionic Bond
Which of the following compounds has the highest lattice energy?
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About This Question
- Subject
- chemistry
- Chapter
- chemical bonding and molecular structure
- Topic
- ionic bond
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
MgO
Lattice Energy (U) is the energy released when one mole of an ionic crystalline compound is formed from gaseous ions. According to Coulomb's Law: U∝r0q1q2 Where q1,q2 are the charges and r0 is the distance between ions.
- In MgO, ions are Mg2+ and O2−. The product of charges is 4.
- In NaCl, ions are Na+ and Cl−. The product of charges is 1.
- In KBr, ions are K+ and Br−. The product of charges is 1.
- In CaCl₂, ions are Ca2+ and Cl−. Higher charge on Ca, but distance is larger. Since MgO has high charges and small ionic radii, it has the highest lattice energy.
This medium difficulty chemistry question is from the chapter chemical bonding and molecular structure, covering the topic of ionic bond. It appeared in the 2025 exam.
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