Which one among the following oxides has the highest melting point ?
- A. Na_{2}O
- B. MgO ✓
- C. Fe_{2}O_{3}
- D. CuO
Correct Answer: B. MgO
Explanation
MgO has a very high lattice energy due to the +2 and -2 charges on its respective ions and their small ionic radii, leading to an extremely high melting point (approx 2852 °C).
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