Which of the following represents the correct increasing order of calorific value of the given fuels ?

Options

A. Hydrogen `lt` LPG `lt` Biagas `lt` Cow dung cake `lt` Coal
B. Cow dung cake `lt` Biagas `lt` LPG `lt` Coal `lt` Hydrogen
C. Cow dung cake `lt` Coal `lt `Biagas `lt` LPG `lt` Hydrogen
D. Hydrogen `lt` Cow dung cake `lt` LPG `lt` Biagas `lt` Coal

Explanation

To determine the correct increasing order of calorific value of the given fuels, we need to first identify the calorific values of each fuel mentioned in the video transcript.

### Step-by-Step Solution:

1. **Identify the Fuels and Their Calorific Values**:
- Cow-dung cake: 6,000 to 8,000 kJ/kg
- Coal: 25,000 to 33,000 kJ/kg
- Biogas: 35,000 to 40,000 kJ/kg
- LPG (Liquefied Petroleum Gas): 55,000 kJ/kg
- Hydrogen: 150,000 kJ/kg

2. **List the Calorific Values in Ascending Order**:
- Cow-dung cake: 6,000 to 8,000 kJ/kg (lowest)
- Coal: 25,000 to 33,000 kJ/kg
- Biogas: 35,000 to 40,000 kJ/kg
- LPG: 55,000 kJ/kg
- Hydrogen: 150,000 kJ/kg (highest)

3. **Arrange the Fuels Based on Their Calorific Values**:
- The increasing order of calorific value is:
1. Cow-dung cake
2. Coal
3. Biogas
4. LPG
5. Hydrogen

### Final Answer:
The correct increasing order of calorific value of the given fuels is:
**Cow-dung cake < Coal < Biogas < LPG < Hydrogen**