Question:

Coordination number of Fe in the complexes [Fe(CN)\(_6\)]\(^{4-}\), [Fe(CN)\(_6\)]\(^{3-}\) and [FeCl\(_4\)]\(^{-}\) would be respectively:

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In coordination complexes, the coordination number corresponds to the number of ligands bonded to the central metal ion.
Updated On: Apr 22, 2026
  • 6, 4, 6
  • 6, 6, 4
  • 6, 3, 3
  • 2, 3, 3
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The Correct Option is B

Solution and Explanation

Step 1: Understanding the coordination number.
Coordination number refers to the number of ligands directly bonded to the central metal ion in a complex.

Step 2: Explanation of the options.

- (1) 6, 4, 6: This is not correct, as the coordination number for [FeCl\(_4\)]\(^{-}\) is 4, not 6.
- (2) 6, 6, 4: This is correct. [Fe(CN)\(_6\)]\(^{4-}\) and [Fe(CN)\(_6\)]\(^{3-}\) both have coordination number 6, and [FeCl\(_4\)]\(^{-}\) has coordination number 4.
- (3) 6, 3, 3: This is incorrect for the given complexes.
- (4) 2, 3, 3: This is incorrect for all three complexes.

Step 3: Conclusion.

The correct answer is (2) 6, 6, 4.
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