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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 6 · Set 1 · Q19
(a) Write IUPAC names of the following coordination compounds: (i) [ CoCl_2( en )_2] SO_4 (ii) K_3[ Fe ( C_2 O_4)_3]
(a)
Write IUPAC names of the following coordination compounds :
(i)
$\displaystyle \left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right] \mathrm{SO}_{4}$
(ii)
$\displaystyle \mathrm{K}_{3}\left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
OR
(b)
Differentiate between :
(i)
Double salt and Complex compound
(ii)
Didentate ligand and Ambidentate ligand
Marking-scheme solution
(a)
i) Dichloridobis(ethane-$\displaystyle 1,2$-diamine)cobalt(IV) sulphate
(ii)
Potassium trioxalatoferrate(III)
(b)
i) Double salts dissociate into simple ions while complex compounds do not
dissociate completely into ions when dissolved in water.
(ii)
When a ligand binds through two donor atoms is called a didentate ligand
while a unidentate ligand which has two different donor atoms and either of the two
ligates in the complex is called ambidentate ligand.
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.