Question

which is one reason why hydrogen is considered a better fuel source for cars? it is nonrenewable. it produces carbon dioxide. it emits no harmful emissions. it combines with water to produce electricity.

Explanation:

Hydrogen - oxygen fuel cell reactions produce only water as a by - product, so it has no harmful emissions like carbon monoxide, particulate matter etc. that are common in fossil - fuel based combustion. It is renewable and does not produce carbon dioxide during its use as a fuel in a fuel cell. Also, it does not combine with water to produce electricity; rather, it reacts with oxygen in a fuel cell to produce electricity, heat and water.

Answer:

It emits no harmful emissions.