Which of the following statements is false

Options

A. `CaOCl_(2)` gives `OH^(-),Cl^(-)andOCl^(-)` in aqueous solution
B. Diamond and graphite are allotrops of carbon
C. Bleaching action of `Cl_(2)` in moist condition is not permanent
D. Calomel is `Hg_(2)Cl_(2)`

Explanation

To determine which statement is false, we need to analyze each statement provided in the question.

1. **Statement 1**: Calcium oxychloride (bleaching powder) gives OH⁻, Cl⁻, and OCl⁻ in an aqua solution.
- **Analysis**: This statement is true. Bleaching powder, when dissolved in water, dissociates to produce hydroxide ions (OH⁻), chloride ions (Cl⁻), and hypochlorite ions (OCl⁻).

2. **Statement 2**: Allotropes are more than one physical form of carbon.
- **Analysis**: This statement is true. Carbon exists in several allotropes, including diamond, graphite, and fullerenes, which are different physical forms of carbon.

3. **Statement 3**: The bleaching action of chlorine in moist conditions is not permanent.
- **Analysis**: This statement is true. The bleaching action of chlorine is temporary because it can be reversed, and the color can return once the chlorine is removed or decomposed.

4. **Statement 4**: Allotropes are more than one physical form of carbon.
- **Analysis**: This statement is a repetition of statement 2 and is also true for the same reasons.

Since all the statements analyzed are correct, we need to identify if any statement is false. However, based on the analysis, all statements are true, and there seems to be no false statement among the provided options.

### Conclusion:
None of the statements provided are false based on the analysis.