The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order
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a
Al3+
b
Na+
c
Ba2+
d
Al3+
answer is B.
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Detailed Solution
According to Hardy-Schulze rule, greater the charge ion oppositely charged ion, greater is its coagulating power. Since arsenic sulphide is a negatively charged sol thus, theorder of coagulating power is Na+