TS EAMCET · Chemistry · d and f Block Elements
Which one of the following ions has same number of unpaired electrons as those present in \(\mathrm{V}^{3+}\) ion?
- A \(\mathrm{Fe}^{3+}\)
- B \(\mathrm{Ni}^{2+}\)
- C \(\mathrm{Mn}^{2+}\)
- D \(\mathrm{Cr}^{3+}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{Ni}^{2+}\)
Step-by-step Solution
Detailed explanation
\begin{aligned}{ }_{23} \mathrm{~V} & =[\mathrm{Ar}] 3 d^3 4 s^2 \\ \mathrm{~V}^{3+} & =[\mathrm{Ar}] 3 d^2 4 s^0 \Rightarrow 2 \text { unpaired electrons } \\ { }_{26} \mathrm{Fe} & =[\mathrm{Ar}] 3 d^6 4 s^2 \\ \mathrm{Fe}^{3+} & =[\mathrm{Ar}] 3 d^5 4 s^0 \Rightarrow 5 \text…
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