MCQ
In square planar complex of $Co^{2+}$ ion unpaired electrons are present in
- A$d_{x^2-y^2}$
- B$d_{z^2}$
- ✓$d_{xy}$
- D$d_{zx}$

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$(I)\,[Cr(NO_3)_3(NH_3)_3]$ $(II)\, K_3[Fe(C_2O_4)_3]$ $(III)\,[CoCl_2(en)_2]^+$ $(IV)\, [CoBrCl(ox)_2]^{3-}$
(Given atomic number $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}$ : $24, \mathrm{Mn}: 25, \mathrm{Fe}: 26)$
Statement $I:$- In redox titration, the indicators used are sensitive to change in $pH$ of the solution.
Statement $II:$- In acid-base titration, the indicators used are sensitive to change in oxidation potential.
In the light of the above statements, choose the most appropriate answer from the options given below