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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 1 · Q19
(a) Write IUPAC names of the following coordination compounds: (i) [ Ag ( NH_3)_2][ Ag ( CN )_2] (ii) K_3[ Fe ( C_2 O_4)_3]
(a)
Write IUPAC names of the following coordination compounds :
(i)
$\displaystyle \left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]$
(ii)
$\displaystyle \mathrm{K}_{3}\left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
OR
(b)(i)
Give a chemical test to show that $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{C} l$ and $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{C} l\right] \mathrm{SO}_{4}$ are ionisation isomers.
(ii)
What is meant by the 'Chelate effect'? Give an example.
Marking-scheme solution
(a)
.
(i) Diamminesilver(I) dicyanidoargentate(I)
(ii)
Potassium trioxalatoferrate(III)
OR
$\displaystyle 19$(b).
(i)
[Co(NH3)$\displaystyle 5$(SO4 )]Cl with AgNO3 solution gives white ppt of AgCl
whereas [Co(NH3)5Cl]SO4 does not / [Co(NH3)5Cl]SO4 with
BaCl2 gives white ppt of BaSO4 whereas [Co (NH3)$\displaystyle 5$(SO4)] Cl does
not.
(ii)
Formation of stable complexes by di or polydentate ligand with
single metal atom/ ion.
For example: [Co(en)$\displaystyle 3$]$\displaystyle 3$+
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.