JEE Main 2026 Apr 5 Shift 2, Chemistry Q10: Colour, Magnetism And Stability Of Co-ordination Compounds

JEE Main2026Apr 5, Shift 2Chemistry

Given below are two statements:

Statement-I: Presence of a large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation.

Statement-II: $d_{x y} = d_{x z} = d_{y z} < d_{x^{2} - y^{2}} = d_{z^{2}}$ and $d_{x^{2} - y^{2}} = d_{z^{2}} < d_{x y} = d_{x z} = d_{y z}$ are the d-orbital splittings in $[F e (H_{2} O)_{6}]^{3 +}$ and $[N i (C l)_{4}]^{2 -}$ complex ions respectively.

In the light of the above statements, choose the correct answer from the options given below:

A
Both Statement-I and Statement-II are correct.
B
Both Statement-I and Statement-II are incorrect.
C
Statement-I is correct but Statement-II is incorrect.
D
Statement-I is incorrect but Statement-II is correct.

Solution

Statement-I: Unpaired electrons enable strong metal–metal bonding in the bulk metal, raising the atomisation enthalpy. True.

Statement-II: $[F e (H_{2} O)_{6}]^{3 +}$ is octahedral: $t_{2 g}$ ( $d_{x y}, d_{y z}, d_{z x}$ ) lies below $e_{g}$ ( $d_{x^{2} - y^{2}}, d_{z^{2}}$ ). $[N i C l_{4}]^{2 -}$ is tetrahedral: the splitting inverts so $e$ ( $d_{x^{2} - y^{2}}, d_{z^{2}}$ ) lies below $t_{2}$ ( $d_{x y}, d_{y z}, d_{z x}$ ). Both descriptions match. True.

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JEE Main 2026 Apr 5 Shift 2, Chemistry Q10: Colour, Magnetism And Stability Of Co-ordination Compounds

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