How many of the following reactions/statements are incorrectly given?
 (i)  $\underset{\left(Blue\right)}{{\left[Co{\left(H_{2}O\right)}_6\right]}^{2-}}+4C{l}^{-}\to \underset{\left(Pink\right)}{{\left[CoC{l}_4\right]}^{2-}}+6H_{2}O,\Delta H=+ve$
 (ii)  $\underset{\left(Yellow\right)}{F{e}^{3+}}+SC{N}^{-}\to \underset{\left(Bloodred\right)}{{\left[Fe\left(SCN\right)\right]}^{2-}}$
 (iii) During the reaction between $Mn{O}_4^{-}$  and $C_2{O}_4^{2-}$  in acidic medium at 333K,  $C{O}_2$ acts as autocatalyst
 (iv)  $P_4+3NaOH+3H_{2}O\to P{H}_3+3Na{H}_{2}P{O}_2$
 (v)  $4Zn+10HN{O}_3\left(dilute\right)\to 4Zn{\left(N{O}_3\right)}_2+N_{2}O+4H_{2}O$
 (vi)  $4N{H}_3+5O_2\underset{500K,9bar}{\overset{Pt/Rhgaugecatalyst}{\to }}4NO+6H_{2}O$
 (vii)  $5S{O}_2+2Mn{O}_4^{-}+2H_{2}O\to 5S{O}_4^{2-}+4H^{+}+2\underset{\left(Green\right)}{M{n}^{2+}}$
 (viii) During the preparation of  $C{l}_2$  by Deacon’s process, $CuC{l}_2$ is used as a catalyst.