MCQ
Transition element makes complex compound due to
- ✓Presence of empty $d-$ orbital
- Blarge size
- CVariable valency
- Dpresence of $2e^-$
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[Take; $R =8.314 \,J\, mol ^{-1}\, K ^{-1}$ In $3.555=1.268$]

$2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{\oplus}+4 \mathrm{e}^{-} ; \mathrm{E}_{\mathrm{red}}^{0}=1.23 \mathrm{V}$
$(\mathrm{R}=8.314 \;\mathrm{J} \mathrm{mol}^{-1} \mathrm{K}^{-1} ; \text { Temperature }=298 \;\mathrm{K} ;$ oxygen under std. atm. pressure of $1 \;bar$)