How many of the following statements are correct?
i) Transition element shows variable oxidation states due to d-d-transition
ii) The spin-only magnetic moment ( $μ$ ) if $N i^{2 +}$ in aqueous solution would be 2.82 BM
iii) The general electronic configuration of actinoids in (n-2) $f^{1 - 14}$ (n-1) $d^{0 - 1} n s^{2}$ .
iv) The number of unpaired electrons present in ${[N i C l_{4}]}^{2 -}$ ion is 3
v) $K M n O_{4}$ shows purple colour due to d-d transition

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Statements (i), (ii) & (iii) are correct

Statements (ii) & (iii) are correct

Statements (i), (iv) are correct

Statements (ii), (iv) & (v) are correct

answer is B.

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Detailed Solution

ii) The magnetic moment $(μ) = \sqrt{n (n + 2)} B M$
$N i : 28 \Rightarrow [A r] 4 S^{2} 3 d^{8} N i^{2 +} \Rightarrow [A r] 4 S^{0} 3 d^{8}$
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$n = 2, μ = \sqrt{2 (2 + 2)} n = \sqrt{8} \Rightarrow 2.82 B M$
iii) The general electronic configuration of Actiniods is
$(n - 2) f^{1 - 14} . (n - 1) d^{0 - 1} . n s^{2}$
So, statements (ii) & (iii) are correct