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Question

In the metal carbonyls of general formula M(CO)n (which follows effective atomic number rule) if M is Ni, Fe and Cr then the value of n will be respectively:
  1. 6, 5, 6
  2. 4, 5, 6
  3. 4, 4, 5
  4. 4, 6, 6


Solution

The correct option is B 4, 5, 6
M(CO)n follows EAN rule
EAN = Atomic no. of metal - Oxidation state of metal + 2 coordination number of metal.
 Coordination number=EANAt. No+O.S2 
Coordination number of Ni=3628+02=4
Coordination number of Fe=3626+02=5
Coordination number of Cr=3624+02=6

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