SATHEE: Coordination Compounds - Result Question 60

Coordination Compounds - Result Question 60

####67. Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (Atomic number: $Z n = 30, C r = 24, C o = 27$ , $N i = 28)$

[2005]

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

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

(c) $[C o (N H_{3})_{6}]^{3 +}$

(d) $[N i (N H_{3})_{6}]^{2 +}$

Show Answer

Solution:

(c) $[C o (N H_{3})_{6}]^{3 +} C o^{3 +} (27 - 3 = 24)$

$[C r (N H_{3})_{6}]^{3 +} C r^{3 +} (24 - 3 = 21)$

$d^{2} s p^{3} \to$ (inner octahedral complex & paramagnetic)

$[N i (N H_{3})_{6}]^{2 +} N i^{2 +} (28 - 2 = 26)$

$[Z n (N H_{3})_{6}]^{2 +} Z n^{2 +} (30 - 2 = 28)$

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