$\mathrm{EAN}=\mathrm{Z}-\mathrm{O} \cdot \mathrm{N} \cdot+2(\mathrm{C} \cdot \mathrm{N} \cdot)$
$=26-0+2(5)$
$=26+10$
$=36$
only one central metal atom/lon is present and it follows $EAN$ rule, so it is mononuclear
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${X_{\left( s \right)}} + Y_{\left( {aq} \right)}^{ + 2} \rightleftharpoons {Y_{\left( s \right)}} + X_{\left( {aq} \right)}^{2 + }$
Given :
$E_{{x^{ + 2}}/x}^o = - 1.36\,volt$ ;
$E_{{y^{ + 2}}/y}^o = - 0.76\,volt\,\frac{{2.303\,RT}}{F} = 0.06$
Here en $=$ ethylene diamine
$\mathrm{CrO}_2 \mathrm{Cl}_2+4 \mathrm{NaOH} \rightarrow \mathrm{A}+2 \mathrm{NaCl}+2 \mathrm{H}_2 \mathrm{O}$
$\mathrm{A}+2 \mathrm{HCl}+2 \mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{B}+3 \mathrm{H}_2 \mathrm{O}$