Identify the correct statements:

Options

A. `wedge_(m)` increase with increase in temperature
B. `wedge_(m)` decreases with increase in concentration
C. Specific conductance increases with increase in concentration
D. Specific conductance decreases with increase in temperature

Explanation

To solve the question of identifying the correct statements regarding molar conductance and specific conductance, let's analyze each statement step by step.

### Step 1: Understand Molar Conductance
- **Definition**: Molar conductance (\( \Lambda_m \)) is defined as the conductance of all ions produced by 1 gmol of an electrolyte in a solution.
- **Formula**: The formula for molar conductance is given by:
\[ \Lambda_m = \kappa \times \frac{1000}{C} \]
where \( \kappa \) is the specific conductance and \( C \) is the concentration in mol/L.

### Step 2: Analyze Statement 1
- **Statement**: "The molar conductance increases as the temperature increases."
- **Analysis**: As temperature increases, ionic mobility increases, leading to a higher rate of movement of ions. This results in an increase in molar conductance.
- **Conclusion**: This statement is **correct**.

### Step 3: Analyze Statement 2
- **Statement**: "The molar conductivity decreases with decrease in concentration."
- **Analysis**: Molar conductance is inversely proportional to concentration. When the concentration decreases, the number of ions available for conduction decreases, leading to a decrease in molar conductance.
- **Conclusion**: This statement is **correct**.

### Step 4: Analyze Statement 3
- **Statement**: "The specific conductance increases if I increase the concentration of ions in 1 ml solution."
- **Analysis**: Specific conductance is directly proportional to the concentration of ions. Increasing the concentration of ions in a solution will increase the specific conductance.
- **Conclusion**: This statement is **correct**.

### Step 5: Analyze Statement 4
- **Statement**: "The specific conductance decreases with increase in temperature."
- **Analysis**: When temperature increases, ionic mobility increases, which leads to an increase in specific conductance. Therefore, this statement is incorrect.
- **Conclusion**: This statement is **incorrect**.

### Final Conclusion
The correct statements are:
1. The molar conductance increases as the temperature increases.
2. The molar conductivity decreases with decrease in concentration.
3. The specific conductance increases if I increase the concentration of ions in 1 ml solution.

### Summary of Correct Statements:
- Option 1: Correct
- Option 2: Correct
- Option 3: Correct
- Option 4: Incorrect