Alum is a water purifier because it

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Alum $(K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O)$ contains $Al^{3+}$ ions. When added to water,it undergoes hydrolysis to form $Al(OH)_3$ precipita

Vedclass · Accepted Answer

Coagulates the impurities

Vedclass · Answer

(A) Alum $(K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O)$ contains $Al^{3+}$ ions. When added to water,it undergoes hydrolysis to form $Al(OH)_3$ precipitate. This precipitate is gelatinous and carries a positive charge,which neutralizes the negatively charged colloidal impurities present in water. This process is known as coagulation,which causes the impurities to settle down,making the water clear and fit for drinking.

Similar Questions

Lyophilic sols are more stable than lyophobic sols because:

Bleeding is stopped by the application of ferric chloride. This is because

The colloidal solution of $Fe(OH)_3$ in water is a .......

Which of the following is not a negatively charged sol?

$10 \ mL$ of $0.5 \ M$ $NaCl$ is required to coagulate $1 \ L$ of $Sb_2S_3$ sol in $2$ hours. The flocculating value of $NaCl$ (in millimoles) is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module