MCQ
Calculate crystal field stabilization energy in $[Co(CN)_6]^{3-}$
- ✓$ - 2.4\,{\Delta _0} + 2p$
- B$ + 2.4\,{\Delta _0} + 2p$
- C$ - 3.6{\Delta _0} + 2p$
- D$ - 1.8\,{\Delta _0} + 2p$
✓
Answer
Correct option: A.
$ - 2.4\,{\Delta _0} + 2p$
a
In $\left[ Fe ( CN )_6\right]^{4-}$, iron has $3 d ^6, 4 s ^2$ system in ground state but in excited state it loses two electrons in the formation of ions and two electrons from $4 s$, so thus Cobalt gets $3 d ^6$ configuration. Now it is of low spin complex due to $CN$ ligands so all 6 electrons will go to $t _{2 g }$ orbitals. and o electrons will be in $e _{ g }$ orbital. By applying formula,
In $\left[ Fe ( CN )_6\right]^{4-}$, iron has $3 d ^6, 4 s ^2$ system in ground state but in excited state it loses two electrons in the formation of ions and two electrons from $4 s$, so thus Cobalt gets $3 d ^6$ configuration. Now it is of low spin complex due to $CN$ ligands so all 6 electrons will go to $t _{2 g }$ orbitals. and o electrons will be in $e _{ g }$ orbital. By applying formula,
$\Delta=$ no. of electrons in $t _{2 g } \cdot(-0.4)+$ no. of electrons in $e _{ g }(0.6)$
$=6(-0.4)+0(0.6)$
$=-2.4 \Delta_0$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C-H\xrightarrow{H{{O}^{-}}/\Delta }\underset{(73\%)}{\mathop{(A)}}\,; \\
\end{matrix}$ Product $(A)$ is
→O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C-H\xrightarrow{H{{O}^{-}}/\Delta }\underset{(73\%)}{\mathop{(A)}}\,; \\
\end{matrix}$ Product $(A)$ is
The boiling point of ethyl alcohol should be less than that of
In the following sequence of reactionsThe product $C$ is
→$C{H_3}C{H_2}C{H_2}Br\xrightarrow{{KOH(alc)}}(A)\xrightarrow{{HBr}}(B)\xrightarrow{{KOH\,(aq.)}}(C),$
In which of the following acids, $P-P$ bonds is present?
→Which of the glycosidic linkage between galactose and glucose is present in lactose ?
The $E_2$ product of the following reaction will be ?
→A silver cup is plated with silver by passing $965 $ coulombs of electricity, the amount of silver deposited is ............. $\mathrm{g}$
→Three arrangement, are shown for the complex $[CoBr_2(NH_3)_2(en)]^{\oplus}$. Which one is wrong statement?
→The correct order of bond dissociation enthalpy of halogens is :
Decomposition of $H_2O$ follows a first order reaction. In fifty minutes the concentration of $H_2O_2$ decreases from $0.5$ to $0.125\,\min$ one such decomposition. When the concentration of $H_2O_2$ reaches $0.05\, M,$ the rate of formation of $O_2$ will be :
→