Chromium Ion

Q. Complete the following reactions:
${\mathrm{Cr}}_2\left({\mathrm{SO}}_4{)}_3\right(\mathrm{aq})+6\mathrm{NaOH}(\mathrm{aq})\to 3{\mathrm{Na}}_2{\mathrm{SO}}_4(\mathrm{aq})+$
${\mathrm{Cr}}_2\left({\mathrm{SO}}_4{)}_3\right(\mathrm{aq})+6{\mathrm{NH}}_4\mathrm{OH}(\mathrm{aq})\to$$+2\mathrm{Cr}\left(\mathrm{OH}{)}_3\right(\mathrm{ppt}.)$

1. 3$(N{H}_4{)}_{2}S{O}_4$(aq)
2. 3$(N{H}_4{)}_{2}S{O}_4$(s)
3. 2$Cr(OH{)}_3$(ppt.)
4. 2$C{r}_2{O}_3$(ppt.)

Q. Which one of the following has the maximum number of unpaired electrons?

1. $M{n}^{2+}$
2. $T{i}^{3+}$
3. $V^{3+}$
4. $F{e}^{2+}$