As per the Hardy-Schulze rule,the flocculation values of the following electrolytes for a ferric hydroxide sol are in the order:

• A
  $AlCl_{3} > K_{3}[Fe(CN)_{6}] > K_{2}CrO_{4} > KBr = KNO_{3}$
• B
  $K_{3}[Fe(CN)_{6}] < K_{2}CrO_{4} < AlCl_{3} < KBr < KNO_{3}$
• C
  $K_{3}[Fe(CN)_{6}] > AlCl_{3} > K_{2}CrO_{4} > KBr > KNO_{3}$
• D
  $K_{3}[Fe(CN)_{6}] < K_{2}CrO_{4} < KBr = KNO_{3} < AlCl_{3}$