Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights,
Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shaver etc. ?
(a) Nickel and cadmium (b) Zinc and carbon (c) Lead peroxide and lead (d) Iron and cadmium
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(a) Ni-Cd batteries contain nickel hydroxide as positive electrode plate, a cadmium hydroxide as negative electrode plate, and an alkaline electrolyte as seperator. The chemical reaction which occurs in Ni-Cd battery is
2NiO(OH) + Cd + 2H2O ↔ 2Ni(OH)2 + Cd(OH)2
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