Engineering
Chemistry
Gold Number and Flocculation value
Question

The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order :

Al3+ < Ba2+ < Na+

Al3+ < Na+ < Ba2+

Na+ < Ba2+ < Al3+

Ba2+ < Na+ < Al3+

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Solution

Arsenic Sulphide is negatively charged sol

Na+ < Ba2+ < Al3+