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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 1 · Q19
(a) Write the IUPAC name of the complex [ Pt ( en )_2 Cl_2]^2+. Draw the structure of geometrical isomer of this complex which is optically inactive.
(a)
Write the IUPAC name of the complex $\displaystyle \left[\mathrm{Pt}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{2+}$. Draw the structure of geometrical isomer of this complex which is optically inactive.
OR
(b)(i)
Write the formula of the following coordination compound : Pentaamminecarbonatocobalt(III)chloride
(ii)
Write the IUPAC name of the linkage isomer of the complex $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{NO}_{2}\right)\right] \mathrm{Cl}_{2}$.
Marking-scheme solution
(a)
Dichloridobis(ethane-$\displaystyle 1,2$-diamine)platinum(IV) ion
(i)
[Co(NH3)$\displaystyle 5$(CO3)]Cl
(ii)
Pentaamminenitrito-O-cobalt(III) chloride
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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.