Statement I: Alum may be used as an antiseptic.
Statement II: Coagulation of colloidal particles in blood is caused by ions present in alum.

Options

A. If both Statement I and Statement II are true and Statement II is the correct explanation of Statement I.
B. If both Statement I and Statement II are true but Statement II is not the correct explanation for Statement I
C. If Statement I is true but Statement II is false.
D. If Statement I is false and Statement II is true.

Answer

To analyze the statements regarding alum, we will evaluate each statement step by step.

### Step 1: Understand Statement I
**Statement I:** Alum may be used as an antiseptic.

- **Explanation:** Alum, specifically potassium aluminum sulfate (KAl(SO4)2·12H2O), has been recognized for its antiseptic properties. It is known to inhibit the growth of bacteria and can be used in various medical applications, including as a topical antiseptic.

**Conclusion for Statement I:** This statement is **correct**.

### Step 2: Understand Statement II
**Statement II:** Coagulation of colloidal particles in blood is caused by ions present in alum.

- **Explanation:** When alum dissolves in water, it dissociates into potassium ions (K⁺) and aluminum ions (Al³⁺), along with sulfate ions (SO4²⁻). The aluminum ions can neutralize the negative charges on colloidal particles in blood, leading to coagulation. This process is essential in stopping bleeding and is a mechanism by which alum acts as an antiseptic.

**Conclusion for Statement II:** This statement is also **correct**.

### Step 3: Relationship Between the Statements
- Since both statements are correct and Statement II provides a valid explanation for Statement I, we can conclude that Statement II is indeed the correct explanation of Statement I.

### Final Conclusion:
Both statements are correct, and Statement II is the correct explanation of Statement I.