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Question

The compound X+Y is 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
Both electron affinity of Y and ionisation energy of X is high
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D
Both electron affinity of Y and ionisation energy of X is low
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Solution

The correct option is B Electron affinity of Y is high and ionisation energy of X is low
Ionic compounds are formed between elements out of which one of the species is electropostive and the other is electronegative. The above compound can be formed only when X can easily lose electron and Y can accept electron easily i.e ionisation energy of X should be low and electron affinity of Y should be high .

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