In nickel-cadmium battery, the cathode is composed of:
Correct answer: D. NiO2
- A. Cd
- B. Ni(OH)2
- C. Ni
- D. NiO2
Explanation
Explanation:The correct option is NiO2 because the cathode in a nickel-cadmium battery is typically composed of nickel oxyhydroxide (NiOOH) which is oxidized to form NiO2 during battery discharge.This option is not correct because cadmium (Cd) is the active material in the anode of a NiCd battery. This option is also incorrect because Ni(OH)2 is a common cathode material in nickel-metal hydride (NiMH) batteries, but not in NiCd batteries.This option is also incorrect because nickel metal (Ni) is not a suitable cathode material in a NiCd battery due to its poor electrochemical performance.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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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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