How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from their interaction during the direct combustion of hydrogen and oxygen? I.The direct combustion of hydrogen and oxygen produces several different products,whereas the fuel cell produces only water
II)Much less heat energy is produced in a fuel cell than via direct combustion of hydrogen and oxygen
III)In the fuel cell,there is an oxidation-reduction reaction between hydrogen and oxygen.In the direct combustion of hydrogen and oxygen,there is no such reaction
IV)It is much easier to control the hydrogen and oxygen during direct combustion than during their reaction in a fuel cell

Question

How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from their interaction during the direct combustion of hydrogen and oxygen?  I.The direct combustion of hydrogen and oxygen produces several different products,whereas the fuel cell produces only water
II)Much less heat energy is produced in a fuel cell than via direct combustion of hydrogen and oxygen
III)In the fuel cell,there is an oxidation-reduction reaction between hydrogen and oxygen.In the direct combustion of hydrogen and oxygen,there is no such reaction
IV)It is much easier to control the hydrogen and oxygen during direct combustion than during their reaction in a fuel cell

Quizplus · Accepted Answer

Option I is correct because during direct combustion, hydrogen and oxygen produce not only water but also heat and light energy. In contrast, in a fuel cell, they only produce water. 
Option II is correct as the heat generated by direct combustion is much greater than the energy generated by a fuel cell. 
Option III is correct since the fuel cell operates on the principle of an oxidation-reduction reaction between hydrogen and oxygen. On the other hand, there is no such reaction in direct combustion. 
Option IV is incorrect because it is easier to control the hydrogen and oxygen during their reaction in a fuel cell than in direct combustion.

How Does the Reaction of Hydrogen and Oxygen to Produce