The substance expected to have the highest ignition temperature out of the following is

Options

A. kerosene
B. petrol
C. coal
D. alcohol

Answer

To determine which substance has the highest ignition temperature from the given options, we will analyze the ignition temperatures of each substance mentioned.

### Step-by-Step Solution:

1. **Understand Ignition Temperature**:
- Ignition temperature is the minimum temperature at which a substance catches fire and starts burning.

2. **List the Ignition Temperatures**:
- Kerosene: 38 to 72 degrees Celsius
- Petrol: below 21 degrees Celsius
- Coal: 155 degrees Celsius
- Alcohol: 16.6 degrees Celsius

3. **Compare the Ignition Temperatures**:
- Kerosene has a range of ignition temperatures starting from 38 degrees Celsius.
- Petrol ignites at a temperature below 21 degrees Celsius, which is lower than kerosene.
- Coal ignites at 155 degrees Celsius, which is significantly higher than the other substances.
- Alcohol ignites at 16.6 degrees Celsius, which is the lowest among the listed substances.

4. **Identify the Highest Ignition Temperature**:
- From the comparison, coal has the highest ignition temperature at 155 degrees Celsius.

5. **Conclusion**:
- Therefore, the substance expected to have the highest ignition temperature is **Coal**.