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The coagulating power of electrolytes having ions Na + , Al 3+ and Ba 2+ for arsenic sulphide sol increases in the order -

1. Ba 2+ < Na + < Al 3+
2. Al 3+ < Na + < Ba 2+
3. Al 3+ < Ba 2+ < Na +
4. Na + < Ba 2+ < Al 3+

Correct answer: Na + < Ba 2+ < Al 3+

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