MCQ
Geometrical as well as optical isomerism is shown by
- A$[Cr(C_2O_4)_3]^{-3}$
- B$[Co(NH_3)_3 Cl_3]$
- ✓$[Cr(H_2O)_2 (C_2O_4)_2]^-$
- D$[Co(en)Cl_4]^-$
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$A \,|\, A^+\, (xM)\, ||\, B^+ \,(yM)\, |\, B$
The $emf$ measured is $+ 0.20\, V.$ The cell reaction is

$C{H_3}CN\xrightarrow{{Na/{C_2}{H_5}OH}}A\xrightarrow{{HN{O_2}}}B\xrightarrow{{{\text{copper}}}}C$