${\mathrm{NH}}_2-\mathrm{CO}-{\mathrm{NH}}_2+{\mathrm{H}}_2\mathrm{O}\to \text{ Basic gas }\left(\mathrm{G}\right)+{\mathrm{H}}_2{\mathrm{CO}}_3$  Which of the following is/are true

${\mathrm{AgCl}}_{\left(\mathrm{s}\right)}+(\mathrm{G}-\text{ solution })\to \text{ colour less solution }\stackrel{\mathrm{KI}}{⟶}\text{ yellow ppt }$

${\mathrm{CuSO}}_4+\mathrm{G}-\text{ solution }\to \text{ black ppt }$

$\text{ Co }(\mathrm{OH}{)}_{2\left(\mathrm{s}\right)}+(\mathrm{G}-\text{ solution })\to \text{ low spin comples }$

${\mathrm{FeCl}}_{3\left(\mathrm{aq}\right)}\stackrel{(\mathrm{G}-\text{ solution })}{⟶}\text{ brown ppt }$