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# A sol has positively charged colloidal particles. Which of the following solutions is required in lowest concentration for coagulation?

(a) $NaCl$

(b) $K_4[Fe(CN)_6]$

(c) $ZnCl_2$

(d) $Na_2SO_4$

Answer: $K_4[Fe(CN)_6]$

According to Hardy Schulze rule, the ion having opposite charge to sol particles cause coagulation and greater the valency of the oppositely charged ion more is the coagulating power.