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  4. According to Fajans rule covalent bond is favoured by:

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Q. According to Fajans rule covalent bond is favoured by:

EAMCETEAMCET 1998Chemical Bonding and Molecular Structure

Solution:

According to Fajans rule : (i) The cations with smaller size have higher polarising power. (ii)The anions with large size have high polarisability. (iii)There should be high charge on cation or theanionorboth. (iv) Cations with pseudo inert gas configuration $ (n{{s}^{2}}{{p}^{6}}{{d}^{10}}) $ or with inert pair configuration $ {{d}^{10}}(n+1){{s}^{2}}, $ have high polarising power, while cations with noble gas configuration $ (n{{s}^{2}}{{p}^{6}}) $ have low polarising power.