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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 6 · Set 1 · Q25
(a) Answer the following about the complexes [ FeF_6]^3- and [ Fe ( CN )_6]^4-: (i) Write the hybridization involved in each case. (ii) Which of them…
Answer the following about the complexes$\displaystyle \left[\mathrm{FeF}_{6}\right]^{3-}$ and $\displaystyle \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}$:
(i)
Write the hybridization involved in each case.
(ii)
Which of them is the outer orbital complex and which one is the inner orbital complex?
(iii)
Compare their magnetic behaviour. [Atomic number: $\displaystyle \mathrm{Fe}=26$ ]
(i)
What happens to the colour of complex $\displaystyle \left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ when heated gradually?
(ii)
Write the electronic configuration for $\displaystyle \mathrm{d}^{5}$ ion if $\displaystyle \Delta_{\mathrm{o}}<\mathrm{P}$.
(iii)
Write the hybridization and magnetic behaviour of the complex $\displaystyle \left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$. [Atomic number: Ni=$\displaystyle 28$]
Marking-scheme solution
(a)
[FeF6]$\displaystyle 3$– -sp3d2
[Fe(CN)$\displaystyle 6$]$\displaystyle 4$– - d2sp3
(b)
[FeF6]$\displaystyle 3$– -outer orbital complex
[Fe(CN)$\displaystyle 6$]$\displaystyle 4$– - inner orbital complex
(c)
[FeF6]$\displaystyle 3$– - paramagnetic
[Fe(CN)$\displaystyle 6$]$\displaystyle 4$- -diamagnetic
(a)
It becomes colourless/ colour slowly fades away
(b)
t2g3eg2
(c)
sp3, diamagnetic
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.