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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 1 · Q24
(a) What is meant by crystal field splitting energy? For a d^4 ion, write the configuration if (i) Δ_o < P, and (ii) Δ_o > P. (b) Explain why in…
(a)
What is meant by crystal field splitting energy ? For a $\displaystyle \mathrm{d}^{4}$ ion, write the configuration if (i) $\displaystyle \Delta_{\mathrm{o}}<\mathrm{P}$, and (ii) $\displaystyle \Delta_{\mathrm{o}}>\mathrm{P}$.
(b)
Explain why in tetrahedral coordination entities, low spin configurations are rarely observed.
Marking-scheme solution
(a)
The difference of energy between the two sets of d-orbitals t2g and eg due to the presence
of ligands in a definite geometry. / The energy required to split the degenerate d-orbitals
into two sets of orbitals.
(i)
t32g e1g
(ii)
t42g e0g
(b)
Orbital splitting energy is not sufficiently large for causing pairing of electrons
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.