AIIMS 2019 Chemistry Metal Oxides Assertion Reason Question
The melting point of CrO₃ and Al₂O₃ are 197 °C and 2072 °C respectively. CrO₃ x - 6 = 0 x = 6 Al₂O₃ 2x - 6 = 0 x = 3 Therefore, both statements are correct but Reason is not the correct explanation of Assertion
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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