The correct answer is option 1. i-d, ii-c, iii-a, iv-b
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Column I
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Column II
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(i) Lechlanche cell
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(d) reaction at anode,\(Zn \rightarrow Zn^{2+} + 2e^-\)
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(ii) Ni- Cd cell
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(c) rechargeable
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(iii) Fuell cell
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(a) cell \(2 H_2 + O_2 \rightarrow 2H_2O\)
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(iv) Mercury cell
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(b) does not involve any ion in solution and is used in hearing aids
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(i) Leclanché cell: In a Leclanché cell, the anode reaction involves the oxidation of zinc metal to form zinc ions (\(Zn^{2+}\)) and two electrons (\(2e^-\)).
(ii) Ni-Cd cell: The Ni-Cd (Nickel-Cadmium) cell is a rechargeable battery and is known for its ability to be charged and discharged multiple times.
(iii) Fuel cell: In a fuel cell, hydrogen (\(H_2\)) and oxygen (\(O_2\)) react to form water (\(H_2O\)) through an electrochemical process that produces electricity.
(iv) Mercury cell: A mercury cell does not involve any ions in the solution. It uses a reaction between amalgams (e.g., zinc amalgam) and mercury oxide to generate electricity and is used in devices like hearing aids.
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