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Chemistry · 2026 · 2 marks
CBSE 2026 · Region 3 · Set 1 · Q20
(a) Write IUPAC names of the following compounds: (i) [ PtCl_2( en )_2] SO_4 (ii) ( NH_4)_2[ CoF_4]
(a)
Write IUPAC names of the following compounds :
(i)
$\displaystyle \left[\mathrm{PtCl}_{2}(\mathrm{en})_{2}\right] \mathrm{SO}_{4}$
(ii)
$\displaystyle \left(\mathrm{NH}_{4}\right)_{2}\left[\mathrm{CoF}_{4}\right]$
OR
(b)
Define the following terms with a suitable example in each case :
(i)
Ambidentate ligand
(ii)
Double salt
Marking-scheme solution
(i)
Dichloridobis(ethane-$\displaystyle 1$, $\displaystyle 2$-diamine) platinum(IV) sulphate
(ii)
Ammonium tetrafluoridocobaltate (II)
(i)
A ligand which has two different donor atoms and either of the two ligates
in the complex.
Ex. CN-$\displaystyle 1$, SCN-$\displaystyle 1$,NO2-
(ii)
Double Salts are made up of two or more stable compounds in a
stoichiometric ratio. / In water, double salts completely dissociate into simple
ions.
Ex.FeSO4.(NH4)2SO4.6H2O / K2SO4.Al2(SO4) 3.24H2O
All Coordination Compounds questions2026 question paperNCERT solutions: Coordination CompoundsPractice Coordination Compounds →
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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.