Which of the following salts will give highest $pH$ in water?

The $pH$ of a salt solution depends on the nature of its hydrolysis:$\text{KCl}$ and $\text{NaCl}$: Salts of strong acid and strong base. They do not undergo hydrolysis; $pH\approx 7$.${\text{CuSO}}_4$: Salt of strong acid (${\text{H}}_2{\text{SO}}_4$) and weak base (${\text{Cu(OH)}}_2$). It undergoes cationic hydrolysis, making the solution acidic ($pH<7$).${\text{Na}}_2{\text{CO}}_3$: Salt of weak acid (${\text{H}}_2{\text{CO}}_3$) and strong base ($\text{NaOH}$). It undergoes anionic hydrolysis, making the solution basic ($pH>7$).Since ${\text{Na}}_2{\text{CO}}_3$ creates a basic solution, it will have the highest $pH$.