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Blood : negatively charged sol According to Hardly-schulz rule, for the negatively charged sol, most (+) ve ion is needed for its efficient coagulation.

1. Blood : negatively charged sol
2. According to Hardly-schulz rule, for the negatively charged sol, most (+) ve ion is needed for its efficient coagulation.
3. Ans : FeCl3
4. FeCl3

Correct answer: Ans : FeCl3

Solution

FeCl3 is the correct answer because it contains a high concentration of positively charged iron ions, which are effective in neutralizing the negative charge of the sol, thus promoting coagulation according to the Hardy-Schulz rule.

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