Select incorrect statement:

Options

A. Red lead is `Pb_(3)O_(4)`
B. `(Me)_(2) SiCl_(2)` on hydrolysis and then on subsequent intermolecular condensation gives cross linked silicones.
C. `SiO_(4)^(4-)` on hydrolysis with water or acid produces `Si_(2)O_(7)^(6-)`
D. None

Explanation

To solve the question of selecting the incorrect statement, let's analyze each of the given statements step by step.

### Step 1: Analyze Statement A
**Statement A:** Red lead is Pb3O4.

- **Analysis:** This statement is correct. Red lead, also known as lead tetroxide, has the chemical formula Pb3O4. It is commonly used in various applications, including as a pigment in paints and in the production of sindoor.

**Hint:** Check the chemical formula against known compounds to verify correctness.

### Step 2: Analyze Statement B
**Statement B:** Me2SiCl2 on hydrolysis, then on subsequent intermolecular condensation gives cross-linked silicon.

- **Analysis:** This statement is incorrect. The correct process involves hydrolysis, which leads to the formation of silanol groups (Si-OH) that can then undergo intermolecular condensation to form cross-linked polymers. The statement incorrectly states that condensation occurs before hydrolysis.

**Hint:** Remember the sequence of reactions: hydrolysis occurs first, followed by condensation.

### Step 3: Analyze Statement C
**Statement C:** SiO4 on hydrolysis with water or acid produces Si2O7.

- **Analysis:** This statement is correct. The orthosilicate ion (SiO4^4-) can undergo hydrolysis to form the pyrosilicate ion (Si2O7^6-), which is a well-known reaction in silicate chemistry.

**Hint:** Familiarize yourself with the common reactions of silicate ions to confirm their transformations.

### Step 4: Analyze Statement D
**Statement D:** None.

- **Analysis:** This statement cannot be the answer since we have already identified Statement B as the incorrect statement.

**Hint:** If you find an incorrect statement, "none" cannot be the answer.

### Conclusion
After analyzing all statements, we conclude that the incorrect statement is:

**Answer:** Statement B is incorrect.

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