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The flocculating power of the given ions for the specified colloidal sols will be such that

Options

  1. AArsenic sulphoid sol Ferric hydroxide sol F e C N 6 4 - > P O 4 3 - > S O 4 2 - > C l - A l 3 + > B a 2 + > N
  2. BArsenic sulphoid sol Ferric hydroxide sol A l 3 + > B a 2 + > N a + F e C N 6 4 - > P O 4 3 - > S O 4 2 - > C
  3. CArsenic sulphoid sol Ferric hydroxide sol N a + > B a 2 + > A l 3 + C l - > S O 4 2 - > P O 4 3 - > F e C N 6
  4. DArsenic sulphoid sol Ferric hydroxide sol C l - > S O 4 2 - > P O 4 3 - > F e C N 6 4 - N a + > B a 2 + > A l

Correct answer

B. Arsenic sulphoid sol Ferric hydroxide sol A l 3 + > B a 2 + > N a + F e C N 6 4 - > P O 4 3 - > S O 4 2 - > C

Step-by-step solution

Coagulation power depends on nature of charge and amount of charge Coagulation power ∝ charge on ion of electrolyte As Arsenic sulphoid sol is negatively charged so for it cations will cause precipitation of ions and the order is A l 3 + > B a 2 + > N a + As Ferric hydroxide sol is positively charged so for it anions will cause precipitation of ions and the order is F e C N 6 4 - > P O 4 3 - > S O 4 2 - > C l -

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