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Question

According to Fajan's rule, covalent bond is favoured by:

A
small cation and large anion
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B
small cation and small anion
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C
large cation and large anion
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D
large cation and small anion
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Solution

The correct option is A small cation and large anion
According to Fajan's rules of polarization, more the size of anion, more easily it will be polarized and hence, the compound will be more covalent.

Less the size of cation, more will be it's polarizing power and hence, compound will be more covalent.

So, option A is the correct answer.

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