CBSE 2026 · Region 5 · Set 2 · Q25 · 3 marks
(a)Write the IUPAC name of the given complex : $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}\right] \mathrm{Cl}_{2}$(b)Define polydentate ligand. Give an example.(c)Mention the type of isomerism exhibited by the given complex : $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3}$
(a)
Write the IUPAC name of the given complex : $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}\right] \mathrm{Cl}_{2}$
(b)
Define polydentate ligand. Give an example.
(c)
Mention the type of isomerism exhibited by the given complex : $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3}$
Marking-scheme solution
(a)
Tetraammineaquachloridocobalt(III)chloride
(b)
When several donor atoms are present in single ligand.
Example : EDTA
(c)
Optical isomerism
Coordination CompoundsNomenclature of Coordination CompoundsRemembershort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.