Hydrogen is a very useful gas and can be used to produce energy for vehicle fuel via combustion reaction. Which of the following characteristics of hydrogen has no contribution in making the hydrogen favorable as a general energy source in vehicle?    a) The combustion of hydrogen is very exothermic   b) The only product from the hydrogen combustion is H20, which is non-pollutant   c) Hydrogen is renewable and abundant in our environment   d) Hydrogen is a good reducing agent

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