CBSE 2026 · Region 5 · Set 3 · Q25 · 3 marks
(a)Write the IUPAC name of the given complex : $\displaystyle \mathrm{K}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]$(b)Differentiate between a double salt and a complex.(c)Mention the type of isomerism exhibited by the following complex : $\displaystyle \left[\operatorname{Pt}\left(\mathrm{NH}_{3}\right)\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}_{2}\right]$
(a)
Write the IUPAC name of the given complex : $\displaystyle \mathrm{K}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]$
(b)
Differentiate between a double salt and a complex.
(c)
Mention the type of isomerism exhibited by the following complex : $\displaystyle \left[\operatorname{Pt}\left(\mathrm{NH}_{3}\right)\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}_{2}\right]$
Marking-scheme solution
(a)
Potassium tetrahydroxidozincate (II)
(b)
Double salts dissociate into simple ions completely when dissolved in water whereas
complex does not dissociate completely into simple ions when dissolved in water.
(c)
Geometrical isomerism / Cis-trans 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.