SATHEE: Coordination Compounds - Result Question 55

Coordination Compounds - Result Question 55

####62. Which of the following complex ions is expected to absorb visible light?

[2009]

(a) $[T i (e n)_{2} (N H_{3})_{2}]^{4 +}$

(b) $[C r (N H_{3})_{6}]^{3 +}$

(c) $[Z n (N H_{3})_{6}]^{2 +}$

(d) $[S c (H_{2} O)_{3} (N H_{3})_{3}]^{3 +}$

(At. no. $Z n = 30, S c = 21, T i = 22, C r = 24$ )

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Solution:

(b) Since $C r^{3 +}$ in the complex has unpaired electrons in the d orbital, hence will be coloured $T i = [A r] 3 d^{2} 4 s^{2}$ $T i^{4 +} = 3 d^{0}$

$C r = [A r] 3 d^{5} 4 s^{1}$

$C r^{3 +} = 3 d^{3}$

$\begin{matrix} Z n = [A r] 3 d^{10} 4 s^{2}; & Z n^{2 +} = 3 d^{10} \\ S c = [A r] 3 d^{1} 4 s^{2}; & S c^{3 +} = 3 d^{0} \end{matrix}$

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