Question

When negatively charged colloid like $A{s}_2{S}_3$ sol is added to positively charged $Fe{\left(OH\right)}_3$ sol in suitable amounts, then :

• A. both the sols are precipitated simultaneously
• B. this process is called mutual coagulation
• C. they becomes positively charged colloid
• D. they become negatively charged colloid

Answer 1

Answer: (A), (B)

The correct options are
A both the sols are precipitated simultaneously
B this process is called mutual coagulation

Since the two colloids are oppositely charged, when we mix them together, they coagulate due to opposite charge colloidal sol and form precipitate simultaneously.

This process is called mutual coagulation.