98. Solving a chemistry problem

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4. To 80 ml of 0.02 M NaCl solution, 25 ml of 0.01 N AgNO3 solution was added. Arrange the electrolytes NaBr, Ba(NO3)2, K2CrO4, MgSO4, AlCl3 in order of decreasing coagulation threshold in relation to the resulting sol.
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