1
Question
Ferric hydroxide sol is
positively charged colloid. The coagulating power of
ions would be in the
order
Ferric hydroxide sol is positively charged colloid. The coagulating power of
ions would be in the
order
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Solution
The correct option is C
According to Hardy schulze rule the ions having
opposite charge to sol particle cause coagulation and greater the valency of
oppositely charged ion more is the coagulating power 
).
According to Hardy schulze rule the ions having
opposite charge to sol particle cause coagulation and greater the valency of
oppositely charged ion more is the coagulating power ).
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