A mountain rescue base uses a hydrogen/oxygen fuel cell to provide backup electricity. The hydrogen is made on site by electrolysis of water using electricity from solar panels.
A technician says:
"The system cannot have low carbon dioxide emissions overall, because making hydrogen always releases carbon dioxide."
Which is the best evaluation of this claim?
The claim is correct, because carbon dioxide is formed when electrolysis splits water to produce hydrogen.
The claim is wrong. Using renewable solar electricity to make hydrogen gives the fuel cell very low carbon emissions overall, and the fuel cell releases only water.
The claim is misleading. The method used to make hydrogen does not affect the system's overall carbon dioxide emissions.
The claim is correct, because solar panels release carbon dioxide while generating the electricity used for electrolysis.
131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.