Lattice energy of II A group compounds (oxides, carbonates, ourides) :

decreases as size of the ion increases.

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increases as size of the ion increases.

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constant for a given type of anion.

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all the above are incorrect.

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Solution

The correct option is A decreases as size of the ion increases.
As we move down the group, size of cations increases and distance between cation and anion decreases so lattice energy decreases.

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Lattice energy of II A group compounds (oxides, carbonates, ourides) :

The correct option is A decreases as size of the ion increases.As we move down the group, size of cations increases and distance between cation and anion decreases so lattice energy decreases.

The correct option is A decreases as size of the ion increases.
As we move down the group, size of cations increases and distance between cation and anion decreases so lattice energy decreases.