Which of the following is responsible for the high melting and boiling points of ionic compounds?

High lattice energy

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High hydration energy

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Low ionization energy of the cation

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High electron affinity of the anion

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Solution

The correct option is A High lattice energy
Lattice dissociation enthalpy is the amount of energy required to dissociate an ionic compound into its gaseous ions. Greater the dissociation energy, then it is more difficult to dissociate. Hence, greater the lattice energy, greater is the melting and boiling points.

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