Liquid and gaseous fuels have more advantages over solid fuels. Some of the advantages are
Calorific value of liquid and gaseous fuels is higher than the solid fuels.
Liquid and gaseous fuels have higher ignition temperatures than the solid fuels.
Liquid and gaseous fuels are easier to store since solid fuels occupy lot of space.
Liquid and gaseous fuels burn completely, leaving no residue.
The correct advantages are

Options

A. (i), (ii) and (iii) only
B. (i), (iii) and (iv) only
C. (ii), (iii) and (iv) only
D. (i), (ii) and (iv) only.

Answer

To answer the question regarding the advantages of liquid and gaseous fuels over solid fuels, we can analyze each statement provided and determine their correctness step by step.

### Step-by-Step Solution:

1. **Calorific Value**:
- **Statement**: "Calorific value of liquid and gaseous fuels is higher than the solid fuels."
- **Analysis**: This statement is correct. Liquid and gaseous fuels generally have a higher calorific value, meaning they produce more energy per unit when burned compared to solid fuels.

2. **Ignition Temperature**:
- **Statement**: "Liquid and gaseous fuels have higher ignition temperatures than the solid fuels."
- **Analysis**: This statement is incorrect. In fact, liquid and gaseous fuels usually have lower ignition temperatures than solid fuels, which means they ignite more easily.

3. **Storage**:
- **Statement**: "Liquid and gaseous fuels are easier to store since solid fuels occupy a lot of space."
- **Analysis**: This statement is correct. Liquid and gaseous fuels require less space for storage compared to solid fuels, making them more convenient to handle.

4. **Combustion Residue**:
- **Statement**: "Liquid and gaseous fuels burn completely, leaving no residue."
- **Analysis**: This statement is correct. Liquid and gaseous fuels typically burn more completely than solid fuels, which can leave ash and other residues.

### Conclusion:
Based on the analysis:
- **Correct Advantages**:
- Statement 1 (Calorific value is higher) is correct.
- Statement 2 (Higher ignition temperature) is incorrect.
- Statement 3 (Easier to store) is correct.
- Statement 4 (Burn completely, leaving no residue) is correct.

Thus, the correct advantages are statements 1, 3, and 4.

### Final Answer:
The correct advantages are:
1. Calorific value of liquid and gaseous fuels is higher than the solid fuels.
3. Liquid and gaseous fuels are easier to store since solid fuels occupy a lot of space.
4. Liquid and gaseous fuels burn completely, leaving no residue.