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  4. Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

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Q. Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

KEAMKEAM 2007Coordination Compounds

Solution:

${ }_{28} Ni ^{2+}$ in $\left[N i\left( NH _{3}\right)_{6}\right]^{2+}$ has $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{8}$ configuration. It uses $4^\text{th}$ orbital to show $s p^{3} d^{2}$ hybridizaation to form outer complex with $2$ unpaired electrons in $3 d -$ orbital.