JEE Advanced 2012 Chemistry question

exhibits temperature dependent magnetic behaviour (paramagnetic / diamagnetic). The coordination geometries of in the paramagnetic and diamagnetic states are respectively

(A)tetrahedral and tetrahedral
(B)square planar and square planar
(C)tetrahedral and square planarCorrect
(D)square planar and tetrahedral

Answer: (C)

Solution

is and the complex is four-coordinate. In a tetrahedral () arrangement the eight d electrons occupy the d orbitals with two unpaired electrons, so the complex is paramagnetic. In a square planar () arrangement the large splitting puts all eight

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Question ID VK-026084