Among the following, choose incorrect set of pair

According to Criss- cross method we can predict the chemical formula for ions. Aluminium Sulphate,  ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$ is formed from $2{\mathrm{Al}}^{+3} \& 3 {\mathrm{SO}}_4^{-2}$ ions.

Similarly ${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2$ is formed from $3 {\mathrm{Ca}}^{+2} \& 2{\mathrm{PO}}_4^{-3}$ ions

${\mathrm{Na}}_2{\mathrm{CO}}_3$  is obtained from $2{\mathrm{Na}}^{+} \& {\mathrm{CO}}_3^{-2}$ ions

Lead Nitrate, $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$is formed from ${\mathrm{Pb}}^{+2} \& 2{\mathrm{NO}}_3^{-} \mathrm{ions}$

Calcium Phosphide obtained from $3{\mathrm{Ca}}^{+2} \&\hspace{0.17em}2{\mathrm{P}}^{-3} \mathrm{ions}$