MCQ
The $pK_b$ of $C{N^\Theta }$ is $4.7.$ The $pH$ of solution prepared by mixing $2.5\,mol$ of $KCN$ and $2.5\,mol$ of $HCN$ in water and making the total volume upto $500\,mL$ is.
- A$10.3$
- ✓$9.3$
- C$8.3$
- D$4.7$
$\mathrm{pOH}=\mathrm{pK}_{\mathrm{b}}+\log \left(\frac{2.5 / 500}{2.5 / 500}\right)=4.7$
$\mathrm{pH}=14-4.7=9.3$
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Defining shape on the basis of the location of $X$ and $Z$ atoms, the total number of species having a square planar shape is
(Nearest integer)
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