Hydrogen gas is sometimes considered as a possible cleaner alternative to fossil fuel in an internal combustion engine. a) Write down a balanced chemical reaction equation for the complete combustion of hydrogen gas with air under stoichiometric conditions. Is this reaction always pollutant free? Explain your answer. b) In your view, can hydrogen gas be a viable alternative to fossil fuel in internal combustion engines for road transportation applications? Explain your answer by considering the main advantages and disadvantages of hydrogen gas. Is there a better option for using hydrogen gas for these applications