100 cm3 of a 0.03% sodium chloride solution were mixed with 250 cm3 of a 0.001 M AgNO3 solution. The following electrolytes were added to the obtained sol: KBr, Ba(NO3)2, K2CrO4, MgSO4, AlCl3. Which of the added electrolytes has the lowest coagulation threshold, the lowest coagulating ability?

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