Statement - I. Salt bridge is used in Electro chemical cell.
Statement - II. The ions of the electrolyte used in salt bridge should have almost same ionic mobility

Options

A. Statement-1 is true, statement-2 is true and statement2 is correct explanation for statement-9
B. Statement-1 is true, statement-2 is true and statement - 2 is NOT the correct explanation for statement-9
C. Statement - 1 is true, statement - 2 is false
D. Statement - 1 is false, statement - 2 is true.

Answer

To analyze the statements provided in the question, we will break down the reasoning step by step.

### Step 1: Understanding the Salt Bridge
The salt bridge is a crucial component of an electrochemical cell. It connects the oxidation and reduction half-cells, allowing for the flow of ions between them. This connection is essential for maintaining the overall function of the cell.

**Hint:** Think of the salt bridge as a pathway that allows ions to move between two different solutions in an electrochemical cell.

### Step 2: Function of the Salt Bridge
The primary function of the salt bridge is to maintain electrical neutrality within the electrochemical cell. When oxidation and reduction reactions occur, ions are produced, and if these ions are not balanced, it can lead to a buildup of charge that would stop the reaction. The salt bridge allows ions to flow to counteract this charge buildup.

**Hint:** Consider what happens if one side of the cell becomes too positive or too negative; how would the salt bridge help?

### Step 3: Ionic Mobility in the Salt Bridge
The second statement mentions that the ions of the electrolyte used in the salt bridge should have almost the same ionic mobility. This is important because if one ion moves significantly faster than the other, it could disrupt the balance of charge in the cell. For example, if the positive ion moves much faster than the negative ion, it could lead to an imbalance that the salt bridge cannot correct.

**Hint:** Reflect on why having equal mobility of ions is crucial for the balance of the electrochemical cell.

### Step 4: Evaluating the Statements
- **Statement I**: "Salt bridge is used in electrochemical cell." This statement is true because the salt bridge is indeed a component of electrochemical cells.
- **Statement II**: "The ions of the electrolyte used in the salt bridge should have almost the same ionic mobility." This statement is also true because equal ionic mobility helps maintain electrical neutrality.

**Hint:** Confirm whether both statements are true and think about the relationship between them.

### Step 5: Analyzing the Explanation
While both statements are true, the second statement does not serve as a correct explanation for the first statement. The first statement's explanation should focus on the role of the salt bridge in maintaining electrical neutrality, rather than the ionic mobility of the ions.

**Hint:** Consider if the second statement directly explains why the first statement is true.

### Conclusion
Both statements are true, but Statement II is not the correct explanation for Statement I. Therefore, the correct answer is that both statements are true, but Statement II does not correctly explain Statement I.

**Final Answer:** Both statements are true, but Statement II is not the correct explanation for Statement I.