AIIMS 2019 Chemistry Metal Oxides Assertion Reason Question
Assertion : Out of & , having lower melting point than . Reason : Oxidation state of in is high
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Option B is correct because the melting point of CrO₃ (197 °C) is significantly lower than that of Al₂O₃ (2072 °C), indicating that the bonding and structure of Al₂O₃, which has a higher ionic character and stronger lattice energy, contribute to its higher melting point. The equations provided (x - 6 = 0 for CrO₃ and 2x - 6 = 0 for Al₂O₃) do not directly explain the difference in melting points, as they pertain to unrelated mathematical expressions rather than the underlying chemistry. Other options are not applicable in this context since they do not provide relevant information or alternative explanations.
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