Which statement about hydrogen as a fuel is true?

Which statement about hydrogen as a fuel is true?

• A. It emits carbon dioxide during use.
• B. It releases energy and forms water with oxygen.
• C. It cannot be used to generate electricity.
• D. It is easily produced without energy.

Answer: (B)

Hydrogen as a fuel releases energy when it reacts with oxygen and forms water. This reaction is exothermic, whether you burn hydrogen or use it in a fuel cell to generate electricity. The main byproduct is water, so there is no carbon dioxide produced during the reaction, making it a clean-burning option. The other statements fail because hydrogen can be used to generate electricity (in fuel cells), and producing hydrogen typically requires energy input (it isn’t produced easily without energy).

Hydrogen as a fuel releases energy when it reacts with oxygen and forms water. This reaction is exothermic, whether you burn hydrogen or use it in a fuel cell to generate electricity. The main byproduct is water, so there is no carbon dioxide produced during the reaction, making it a clean-burning option. The other statements fail because hydrogen can be used to generate electricity (in fuel cells), and producing hydrogen typically requires energy input (it isn’t produced easily without energy).