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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 1 · Set 1 · Q5
(a) (i) On the basis of crystal field theory, write the electronic configuration for d^4 ion if Δ_0< P. (ii) Using valence bond theory, predict the…
(i)
On the basis of crystal field theory, write the electronic configuration for $\displaystyle \mathrm{d}^{4}$ ion if $\displaystyle \Delta_{0}<\mathrm{P}$.
(ii)
Using valence bond theory, predict the hybridization and magnetic character of $\displaystyle \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$.
(Atomic number of $\displaystyle \mathrm{Ni}=28$ )
(iii)
Write the formula of the following complex using IUPAC norms :
Dichloridobis (ethane-$\displaystyle 1,2$-diamine) cobalt (III)
When a co-ordination compound $\displaystyle \mathrm{NiCl}_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}$ mixed with $\displaystyle \mathrm{AgNO}_{3}, 2$ moles of AgCl are precipitated per mole of the compound. Write
(i)
Structural formula of the complex.
(ii)
Secondary valency of 'Ni' in the complex.
(iii)
IUPAC name of the complex.
Marking-scheme solution
(a) (i) \(\displaystyle t_{2 g}^{3} e_{g}^{1}\)
(ii) \(\displaystyle d s p^{2}\), diamagnetic
(iii) \(\displaystyle \left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right]^{+}\)
OR
(b) (i) \(\displaystyle \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}\)
(ii) $\displaystyle 6$
(iii) hexaaquanickel(II) chloride
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.