Out of the following :- (A) ( Al ₂ O ₃ H ₂ O ) - Positive charge colloids (B) ( As ₂ ~S ₃ ) - Positive charge colloids (C) Haemoglobin - Positive charge colloids (D) ( TiO ₂ Sol ) - Negative charge colloids (E) Gold sol. - Negative charge colloids The incorrect match is:-

Step-by-step solution

Here's the reasoning: - ( Al ₂ O ₃ H ₂ O ) : Positive charge colloid Correct - ( As ₂ ~S ₃ ) (arsenic trisulfide): Negative charge colloid - Incorrect (listed as positive, but it is actually negative). - Haemoglobin: Positive charge colloid - Correct. - ( TiO ₂ ) sol: Negative charge colloid Correct. - Gold sol: Negative charge colloid Correct. So, the incorrect matches are ( B ( As ₂ ~S ₃ ) ), D (correctly stated as negative), and E (correctly stated as negative). Therefore, option 4 is correct, as it includes B,