Which of the following are BOTH paramagnetic and outer-orbital (sp^3d^2) octahedral complexes? (F- weak-field; NH3 is strong enough to pair electrons only on Co^3+.)

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc204

Which of the following are BOTH paramagnetic and outer-orbital ( $s p^{3} d^{2}$ ) octahedral complexes? ( $F X^{-}$ weak-field; $NH X_{3}$ is strong enough to pair electrons only on $Co X^{3 +}$ .)

[FeF X_{6}] X^{3 -}

is high-spin

d^{5}

(

n = 5

s p^{3} d^{2}

[Ni (NH X_{3}) X_{6}] X^{2 +}

d^{8}

(

n = 2

s p^{3} d^{2}

[Cr (H X_{2} O) X_{6}] X^{3 +}

is paramagnetic but inner orbital (

d^{2} s p^{3}

[Co (NH X_{3}) X_{6}] X^{3 +}

is low-spin

d^{6}

, diamagnetic and inner orbital. Correct: 1 and 2.