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On the basis of Valence Bond Theory (VBT), state the following regarding complex ion: (Atomic…
(a)
On the basis of Valence Bond Theory (VBT), state the following regarding $[\text{CoF}_6]^{3-}$ complex ion:
(Atomic Number of $\text{Co} = 27$)
(1) Oxidation state of cobalt
(2) Type of hybridisation of the central metal atom
(3) Magnetic behaviour of the complex
(4) IUPAC name of the complex
(b)
Consider the complex ions $[\text{Fe}(\text{CN})_6]^{3-}$ and $[\text{Fe}(\text{CN})_6]^{4-}$.
Which complex ion will be attracted towards applied magnetic field? Justify your answer with a reason.
(Atomic Number of $\text{Fe} = 26$)
(c)
What types of isomerism do the following pairs of compounds show?
(1) $[\text{Co}(\text{NH}_3)_5\text{Br}]\text{SO}_4$ and $[\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Br}$
(2) $[\text{Cr}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}\cdot2\text{H}_2\text{O}$ and $[\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2\cdot\text{H}_2\text{O}$
Answer
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From ISC 2026 Improvement Chemistry Paper 1, question 21(i).