Which of the following is the most environmentally friendly source to derive energy?
Correct answer: B. H2 - O2 fuel cell
- A. Lead-acid accumulator
- B. H2 - O2 fuel cell
- C. Silver oxide battery
- D. Alkaline battery
Explanation
All the sources listed except H2 - O2 fuel cells produce electrical energy but they need to be disposed of eventually. H2 - O2 fuel cells produce energy as long as the reactants are supplied and do not need any kind of disposal.Also, H2-O2 fuel cells produce only water, electricity, and heat as products that don't harm the environment. The lead from lead acid batteries is released into the environment as waste.
This question appeared on the NUMS 2017 paper, which you can sit online with every answer explained.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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