(B) Muddy water contains colloidal clay particles which are negatively charged. $Alum$ $(K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O)$ provides $Al^{3+}$

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(B) Muddy water contains colloidal clay particles which are negatively charged. $Alum$ $(K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O)$ provides $Al^{3+}$ ions. These $Al^{3+}$ ions neutralize the negative charge on the clay particles,causing them to coagulate and settle at the bottom due to gravity.