Which of the following statements is false ?

Options

A. Industrial alcohol is rectified spirit
B. Industrial methylated spirit contains 95% ehtanol and 5% methanol
C. Mineralised methylated spirit contains 90% rectified spirit, 9% methanol and 1% petroleum oil
D. Alcohol can be dried over calcium chloride

Answer

To determine which statement is false among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Rectified Spirit**:
- The first statement claims that industrial alcohol is a rectified spirit.
- **Definition**: Rectified spirit is a solution that typically contains about 96% ethanol and 4% water.
- **Analysis**: Since industrial alcohol is often referred to as rectified spirit, this statement is **true**.

2. **Industrial Methylated Spirit**:
- The second statement mentions that industrial methylated spirit contains 95% ethanol and 5% methanol.
- **Definition**: Methylated spirit is ethanol that has been denatured by the addition of methanol to make it unfit for consumption.
- **Analysis**: This statement is also **true** as it accurately describes the composition of industrial methylated spirit.

3. **Mineralized Methylated Spirit**:
- The third statement states that mineralized methylated spirit contains 90% rectified spirit, 9% methanol, and 1% petroleum.
- **Analysis**: Mineralized methylated spirit indeed contains a significant portion of rectified spirit along with methanol and petroleum, making this statement **true**.

4. **Drying Alcohol with Calcium Chloride**:
- The fourth statement claims that alcohol can be dried over calcium chloride.
- **Analysis**: This statement is **false**. Calcium chloride is typically used to dry other compounds by removing water, but when used with alcohol, it forms an adduct (a compound formed from the addition of two or more substances) and does not effectively remove water from the alcohol.

### Conclusion:
The false statement among the options provided is: **"Alcohol can be dried over calcium chloride."**

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