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Chemistry · 2024 · 3 marks
CBSE 2024 · Region 1 · Set 1 · Q24
(a) Write the formula for the following coordination compound: Potassium tetrahydroxidozincate (II) (b) Arrange the following complexes in the…
(a)
Write the formula for the following coordination compound : Potassium tetrahydroxidozincate (II)
(b)
Arrange the following complexes in the increasing order of conductivity of their solution : \[\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2},\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right],\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3} \]
(c)
Identify the type of isomerism exhibited by the following complexes :
(i)
$\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{2}\right]^{2+}$
(ii)
$\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right] \mathrm{Cl}_{3}$ \[1+1+\left(\frac{1}{2}+\frac{1}{2}\right)=3 \]
Marking-scheme solution
a) \(\displaystyle \mathrm{K}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]\)
(b) \(\displaystyle \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right]<\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}<\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}\)
(c) (i) Linkage isomerism
(ii) Optical isomerism
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CBSE Class 12 Chemistry past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.