Which of the following is NOT a disadvantage of using hydrogen as a fuel?

• A. Hydrogen can be explosive when mixed with air
• B. Hydrogen requires special infrastructure for distribution
• C. Hydrogen is difficult to store and transport
• D. Hydrogen has a high energy content per unit mass

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the question is asking to identify which statement is NOT a disadvantage of using hydrogen as a fuel. This means we need to evaluate each option to see if it is a true disadvantage or not.
2. Step 2: Review the properties of hydrogen as a fuel. Hydrogen is known to be explosive when mixed with air, so this is a valid disadvantage.
3. Step 3: Consider the infrastructure requirements. Hydrogen requires special infrastructure for safe distribution because it is a very light and reactive gas, so this is also a disadvantage.
4. Step 4: Think about storage and transport. Hydrogen is difficult to store and transport due to its low density and the need for high pressure or low temperature, making this a disadvantage as well.
5. Step 5: Evaluate the statement about hydrogen's energy content per unit mass. Hydrogen actually has a very high energy content per unit mass, which is an advantage, not a disadvantage. Therefore, this statement is NOT a disadvantage.