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The pair(s) of complexes where in both exhibit tetrahedral geometry is(are) 
(Note: py = pyridine 
Given: Atomic numbers of Fe, Co, Ni and Cu are 26, 27, 28 and 29, respectively) 

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a
FeCl4−and Fe(CO)42−
b
Co(CO)4−and CoCl42−
c
Ni(CO)4 and Ni(CN)42−
d
Cu(py)4+and Cu(CN)43−

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detailed solution

Correct option is A

(1) FeCl4−Fe2+=3d64s0

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