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Question: The reaction which is taking place in nickel – cadmium battery can be represented by which of the fo...

The reaction which is taking place in nickel – cadmium battery can be represented by which of the following equation?

A

Cd+NiO2+2H2O→Cd(OH)2+Ni(OH)2Cd + NiO_{2} + 2H_{2}O \rightarrow Cd(OH)_{2} + Ni(OH)_{2}

B

Cd+NiO2+2OH−→Ni+Cd(OH)2Cd + NiO_{2} + 2OH^{-} \rightarrow Ni + Cd(OH)_{2}

C

Ni+Cd(OH)2→Cd+Ni(OH)2Ni + Cd(OH)_{2} \rightarrow Cd + Ni(OH)_{2}

D

Ni(OH)2+Cd(OH)2→Ni+Cd+2H2ONi(OH)_{2} + Cd(OH)_{2} \rightarrow Ni + Cd + 2H_{2}O

Answer

Cd+NiO2+2H2O→Cd(OH)2+Ni(OH)2Cd + NiO_{2} + 2H_{2}O \rightarrow Cd(OH)_{2} + Ni(OH)_{2}

Explanation

Solution

Nickel – Cadmium battery

Anode – Cd ; Cathde −NiO2- NiO_{2}; Electrolyte – KOH

At anode : Cd(s)+2OH−(aq)→Cd(OH)2(s)+2e−Cd_{(s)} + 2O{H^{-}}_{(aq)} \rightarrow Cd(OH)_{2(s)} + 2e^{-}

At cathode:

NiO2(s)+2H2O(l)+2e−→Ni(OH)2(s)+2OH−(aq)Cd(s)+NiO2(s)+2H2O(l)→Cd(OH)2(s)+Ni(OH)2(s)NiO_{2(s)} + 2H_{2}O_{(l)} + 2e^{-} \rightarrow Ni(OH)_{2(s)} + 2O{H^{-}}_{(aq)}Cd_{(s)} + Ni{O_{2}}_{(s)} + 2H_{2}O_{(l)} \rightarrow Cd(OH)_{2(s)} + Ni(OH)_{2(s)}