in excess of hot
water. What will happen if excess sodium chloride is added to this colloid?
Answer:
Positively charged ions coagulate the
negatively charged sol and negatively charged ion coagulate the positively
charged sol. Positively charged sol of hydrated ferric oxide is formed when 
is added in excess of
hot water. On adding excess of NaCI to this sol, negatively charged 
ions coagulate the
positively charged sol of hydrated ferric oxide.
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