Which of the following statements is wrong ?

Options

A. The conductance of `1 cm^(3)` of a material is called specific conductance.
B. Specific conductance increases while equilvalent conductance decreases on progressive dilution.
C. The limiting equivalent conductances of weak electrolytes cannot be determined by the extrapolation of the plot of `wedge` against concentration.
D. The conductivity of metals is due to the movement of electrons.

Explanation

To determine which statement is wrong, we will analyze each of the provided options step by step.

### Step 1: Analyze Option 1
**Statement:** The conductance of 1 cm³ form of a material is called specific conductance.

**Analysis:**
- Specific conductance (also known as conductivity) is defined as the conductance of a solution with a length of 1 cm and a cross-sectional area of 1 cm².
- The formula for specific conductance (K) is given by K = G * (L/A), where G is the conductance, L is the length, and A is the area.
- Since this definition is accurate, **Option 1 is true**.

### Step 2: Analyze Option 2
**Statement:** The specific conductance increases while equivalent conductance decreases on progressive dilution.

**Analysis:**
- When a solution is diluted, the number of ions present decreases, leading to a decrease in specific conductance.
- However, the equivalent conductance (which is the conductance per equivalent of solute) increases upon dilution because the degree of ionization increases, allowing more ions to contribute to conductance.
- Therefore, this statement contradicts the established principles of electrochemistry. **Option 2 is false**.

### Step 3: Analyze Option 3
**Statement:** The limiting equivalent conductance of weak electrolytes cannot be determined by the extrapolation of the plot of molar conductance against concentration.

**Analysis:**
- For weak electrolytes, when plotting molar conductance against concentration, the graph typically shows a curve rather than a straight line.
- The limiting equivalent conductance can be determined by extrapolating the graph to zero concentration, but it is not straightforward due to the non-linear behavior.
- Thus, this statement is correct in its assertion that limiting equivalent conductance cannot be easily determined from such a plot. **Option 3 is true**.

### Step 4: Analyze Option 4
**Statement:** The conductivity of metals is due to the movement of electrons.

**Analysis:**
- This statement is accurate. The conductivity in metals arises from the movement of free electrons, which are abundant in metallic structures.
- As temperature increases, the vibrations of the metal lattice increase, which can impede electron flow, leading to decreased conductivity.
- Therefore, this statement is also true. **Option 4 is true**.

### Conclusion
After analyzing all options, we find that **Option 2 is the wrong statement**.