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NDA 1 2024 GAT, question 107

Topic: Chemistry

Q107

Which one among the following oxides has the highest melting point ?

  1. (a) Na2ONa_{2}O
  2. (b) MgOMgOCorrect answer
  3. (c) Fe2O3Fe_{2}O_{3}
  4. (d) CuOCuO

Solution.

Answer: (b) MgOMgO

  1. Magnesium oxide has a very high melting point, around 2800°C, due to its strongly bound ionic lattice of Mg²⁺ and O²⁻.
  2. It exceeds the melting or decomposition temperatures of the other listed oxides.
  3. Thus MgO is correct.