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Quantum Numbers

In which of t...

Question

In which of the following ' $d$ ' subshells are degenerate?

C u_{a q}^{2 +}

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F e_{a q}^{2 +}

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F e_{a q}^{3 +}

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C u_{a q}^{1 +}

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Solution

The correct option is D $C u_{a q}^{1 +}$
The electronic configuration of $C u^{1 +}$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{0}$ . The $3 d$ orbital is completely filled, hence it is degenerate. In all other cases, there is one or more than one vacant space in the $d$ orbital which makes it generated.

$C u^{2 +}$ : $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} 4 s^{0}$

$F e^{2 +}$ : $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{6} 4 s^{0}$

$F e^{3 +}$ : $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{0}$

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Similar questions

The oxidation half reaction for following reaction is

Fe²⁺(aq) + Cr₂O₇^2-(aq) → Fe³⁺ (aq) + Cr³⁺(aq)

3.1

F e^{3 +} (a q)

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{F e}^{2 +} (a q) + {C r}_{2} O_{7}^{2 -} (a q) (acid medium) - ------- \to {F e}^{3 +} (a q) + {C r}^{3 +} (a q)

Using the standard electrode potentials given in the Table 8.1, predict if the reaction between the following is feasible:

(a) Fe³⁺(aq) and I^–(aq)

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(d) Ag(s) and Fe³⁺(aq)

(e) Br₂(aq) and Fe²⁺(aq)

Balance the following redox reactions by ion-electron method:
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$M n O_{4}^{-} (a q) + S O_{2} (g) \to M n^{2 +} (a q) + (a q) H S O_{4 (a q)}^{-}$ (in acidic solution)

$H_{2} O_{2} (a q) + F e^{2 +} (a q) \to F e^{3 +} (a q) + H_{2} O (l)$ (in acidic solution)

$C r_{2} O_{7}^{2 -} + S O_{2} (g) \to C r^{3 +} (a q) + S O_{4}^{2 -}$ (aq) (in acidic solution)

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