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Question

Among the following oxides, which has the maximum lattice energy?

A
MgO
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B
CaO
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C
SrO
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D
BaO
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Solution

The correct option is A MgO
An estimate of the strength of the bonds in an ionic compound can be obtained by measuring the lattice energy of the compound, which is the energy given off when oppositely charged ions in the gas phase come together to form a solid.

Lattice energy of ionic compounds is inversely proportional to size of the ions involved. Mg2+ is the smallest ions among the four (as anion is same in all) and hence MgO has the highest lattice energy.

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