CUET · CHEMISTRY · PYQ PAPER 2025
Arrange the following complexes in decreasing order of number of unpaired electrons on the metal ion
(A) \([Co(NH_{3})_{6}]^{3+}\)
(B) \([CoF_{6}]^{3-}\)
(C) \([FeF_{6}]^{3-}\)
(D) \([Fe(CN)_{6}]^{3-}\)
Choose the correct answer from the options given below:
- A (A), (D), (B), (C)
- B (A), (D), (C), (B)
- C (C), (B), (D), (A)
- D (C), (D), (A), (B)
Answer & Solution
Correct Answer
(C) (C), (B), (D), (A)
Step-by-step Solution
Detailed explanation
(A) \([Co(NH_{3})_{6}]^{3+}\): \(Co^{3+}\) (\(3d^6\)). \(NH_3\) (SFL). Unpaired e\(\text{}^-\) = 0. (B) \([CoF_{6}]^{3-}\): \(Co^{3+}\) (\(3d^6\)). \(F^-\) (WFL). Unpaired e\(\text{}^-\) = 4. (C) \([FeF_{6}]^{3-}\): \(Fe^{3+}\) (\(3d^5\)). \(F^-\) (WFL). Unpaired e\(\text{}^-\)…
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