When hydrogen is burned as a fuel, the primary waste product produced is

Explanation:

A combustion reaction is defined as the one which when reacts with oxygen atom results in the formation of carbon dioxide and water.

As most of the fuels are hydrocarbons hence, they also produce carbon dioxide and water upon combustion.

And, when hydrogen is burned as a fuel then the reaction is as follows.

Thus, we can conclude that when hydrogen is burned as a fuel, the primary waste product produced is .

answer: i would say b.

explanation:

the answer would be a