electrochemistry

Question: Which of the following reaction is used to make a fuel cell

1) $Cd\,(s)+2Ni{{(OH)}_{3}}(s)\to CdO\,(s)+2Ni(OH)+{{H}_{2}}O\,(l)$

2) $Pb\,(s)+Pb{{O}_{2}}(s)+2{{H}_{2}}S{{O}_{4}}(aq)\to 2PbS{{O}_{4}}(s)+2{{H}_{2}}O\,(l)$

3) $2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O\,(l)$

4) $2Fe\,(s)+{{O}_{2}}(g)+4{{H}^{+}}(aq)\to 2F{{e}^{2+}}(aq)+2{{H}_{2}}O\,(l)$

Solution:

Explanation: No Explanation

Electrochemical cells

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