(A) $MgCl_2$ is a salt of a strong acid $(HCl)$ and a weak base $(Mg(OH)_2)$.When dissolved in water,it undergoes cationic hydrolysis: $Mg^{2+} + 2H_2

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(A) $MgCl_2$ is a salt of a strong acid $(HCl)$ and a weak base $(Mg(OH)_2)$.When dissolved in water,it undergoes cationic hydrolysis: $Mg^{2+} + 2H_2O ⇌ Mg(OH)_2 + 2H^+$.Due to the production of $H^+$ ions,the solution becomes acidic.Therefore,the $pH$ of the solution is $< 7$.