AIIMS 2019 Chemistry Ionic Bonds MCQ Question
Assertion : Melting and boiling points of ionic compounds are inversely proportional to the lattice enthalpy.
Reason : Stability of ionic compounds does not depend on the lattice enthalpy.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Lattice enthalpy, which quantifies the energy required to separate one mole of an ionic compound into its gaseous ions, is directly related to the strength of the electrostatic forces between the ions. In ionic compounds, these forces arise from the attraction between positively charged cations and negatively charged anions, resulting in high melting and boiling points. Since option C correctly reflects this relationship, it is the appropriate choice. The other options, being marked as N/A, do not provide relevant information or alternative explanations related to lattice enthalpy or ionic bonding.
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