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Question

The ionic bonds X+Y are formed when:

A
Electron affinity of Y is low and ionisation energy of X is high
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B
Electron affinity of Y is high and ionisation energy of X is low
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C
Lattice energy of XY is low
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D
None of these
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Solution

The correct option is B Electron affinity of Y is high and ionisation energy of X is low
Ionic bonds are only possible when X can easily lose electrons and Y can accept electrons easily i.e, ionisation energy of X should be low and electron gain enthalpy of Y should be high.

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