Ion with the lowest coagulating power for a positively charged sol

The same question, asked 2 times: 4 May 2023 S2*, 15 Apr 2026 S2. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
4 May 2023 S2
78 $Which from following anions has lowest coagulating power for precipitation of positive sol?$
Tap an option to check your answer.
Question 2
15 Apr 2026 S2
31 $Which of the following exhibits the minimum coagulating power for precipitating of positively charged ferric oxide sol ?$
Tap an option to check your answer.