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Chemistry · 2026 · 2 marks
Coordination CompoundsDefinitions of Some Important Terms Pertaining to Coordination Compounds2 marksRemembervery short answer
CBSE 2026 · Region 2 · Set 1 · Q20
(a) Define coordination number. 1+1 (b) Indicate the type of isomerism exhibited by the following complex: [ Co ( en )_3] Cl_3
(a)
Define coordination number. $\displaystyle 1+1$
(b)
Indicate the type of isomerism exhibited by the following complex : $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3}$
Marking-scheme solution
(a)
The coordination number of a metal ion in a complex can be defined as the
number of ligand donor atoms to which the metal atom / ion is directly bonded.
(b)
Optical isomerism.
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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.