In which of the following pairs of complexes the central me…

Chemistry Co-ordinatios Compounds General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

In which of the following pairs of complexes the central metals/ions do have same effective atomic number ?

[Cr(CO) 6 ] and [Fe(CO) 5 ]

[Co(NH 3 ) 6 ] 2+ and [Ni(NH 3 ) 6 ] 2+

[Cu(CN) 4 ] 3– and [Ni(CO) 4 ]

[V(CO) 6 ] – and [Co(NO 2 ) 6 ] 3–

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a,c,d)

EAN of Cr = 24 + 12 = 36 and EAN of Fe = 26 + 10 = 36.

EAN of Co 3+ = 25 + 12 = 37 and EAN of Ni 2+ = 26 + 12 = 38.

EAN of Cu + = 28 + 12 = 36 and EAN of Ni = 28 + 8 = 36.

EAN of V – = 24 + 12 = 36 and EAN of Co 3+ = 24 + 12 = 36.

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