Correct statement among the following is

(1) In the aqueous solution, both HClO₄ and HCl completely ionize.
    $\therefore \text{ acidic strength of }{\mathrm{HClO}}_4=\mathrm{HCl}$
(2) Blood is an acidic buffer $\left({\mathrm{H}}_2{\mathrm{CO}}_3/{\mathrm{HCO}}_3^{-}\right)$
    $\text{ Its }{\mathrm{p}}^{\mathrm{H}}=7.4$
(3) Addition of HCl to NaCl solution increases the ionic product of NaCl. Ionic product exceeds solubility product.NaCl gets precipitated.
(4) ${\mathrm{Fe}}^{+3}+3{\mathrm{Cl}}^{-}+3{\mathrm{H}}_2\mathrm{O}\to \mathrm{Fe}(\mathrm{OH}{)}_3+3{\mathrm{H}}^{+}+3{\mathrm{Cl}}^{-}$
                              or    
    ${\mathrm{Fe}}^{+3}+3{\mathrm{H}}_2\mathrm{O}\to \mathrm{Fe}(\mathrm{OH}{)}_3+3{\mathrm{H}}^{+}$