To stop bleeding from an injury ferric chloride can be applied. Which of the following comment (s) about the statement is justified?
(a) it is not true, ferric chloride is highly poisonous
(b) it is true, `Fe^(3+)` ions coagulate blood which is negatively charged sol.
(c) it is true, coagulation takes place because of formation of negatively charged sol with `Cl^-` ions
(d) it is not true, `Cl^- ` ions form positively charged sol, profuse bleeding takes place (e) it is not true, ferric chloride is ionic and gets into blood stream

Options

A. only (c)
B. (b) & (c)
C. only (b)
D. (a), (d) & (e)

Answer

To determine which comment about the application of ferric chloride to stop bleeding is justified, we will analyze each statement step by step.

### Step 1: Understanding the Role of Ferric Chloride
Ferric chloride (FeCl₃) is an ionic compound that dissociates in solution to produce Fe³⁺ ions and Cl⁻ ions. The Fe³⁺ ions are positively charged, while the Cl⁻ ions are negatively charged.

**Hint:** Recall that blood is a colloidal solution with negatively charged particles.

### Step 2: Analyzing Blood Composition
Blood is primarily a negatively charged colloidal solution. To coagulate or stop bleeding, we need to neutralize these negative charges.

**Hint:** Coagulation requires the neutralization of negative charges in the blood.

### Step 3: Evaluating the Statements
Now, let's evaluate each statement one by one:

#### Statement A: "It is not true, ferric chloride is highly poisonous."
- This statement is incorrect. While ferric chloride can be toxic in large quantities, it is used in controlled amounts for coagulation in medical situations.

**Hint:** Consider the context of medical use versus toxicity.

#### Statement B: "It is true, Fe³⁺ ions coagulate blood which is negatively charged sol."
- This statement is correct. The positively charged Fe³⁺ ions interact with the negatively charged particles in the blood, leading to coagulation.

**Hint:** Focus on the charge interactions between Fe³⁺ ions and blood.

#### Statement C: "It is true, coagulation takes place because of formation of negatively charged sol with Cl⁻ ions."
- This statement is incorrect. Cl⁻ ions do not cause coagulation; rather, they are not involved in the coagulation process as they cannot neutralize the negative charges in blood.

**Hint:** Remember that negatively charged ions cannot coagulate a negatively charged sol.

#### Statement D: "It is not true, Cl⁻ ions form positively charged sol, profuse bleeding takes place."
- This statement is incorrect. Cl⁻ ions do not form a positively charged sol; they remain negatively charged and do not contribute to coagulation.

**Hint:** Think about the nature of Cl⁻ ions and their role in coagulation.

#### Statement E: "It is not true, ferric chloride is ionic and gets into bloodstream."
- This statement is misleading. While ferric chloride is ionic, it does not imply that it causes harm when used appropriately in medical settings.

**Hint:** Consider the implications of ionic compounds in controlled medical applications.

### Conclusion
Based on the analysis, the only justified statement is **Statement B**: "It is true, Fe³⁺ ions coagulate blood which is negatively charged sol."

### Final Answer
The justified comment about the application of ferric chloride to stop bleeding is:
**(b) it is true, Fe³⁺ ions coagulate blood which is negatively charged sol.**