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Question

Now he tried his hands with a calculator. I think you know whats coming next! Which of these observations of Rancho were TRUE?

A
It consists of a cadmium electrode (as anode)
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B
At anode:
Cd(s)+2OH(aq)d(OH)2(s)+2e
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C
At cathode:
NiO2(s)+2H2O+2eNi(OH)2(s)+2OH(aq)
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D
A metal grid containing nickel (IV) oxide acts as cathode
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Solution

The correct options are
A It consists of a cadmium electrode (as anode)
B At anode:
Cd(s)+2OH(aq)d(OH)2(s)+2e
C At cathode:
NiO2(s)+2H2O+2eNi(OH)2(s)+2OH(aq)
D A metal grid containing nickel (IV) oxide acts as cathode
Just recall about Nickel – Cadmium Storage cell from the videos.
This is another rechargeable cell which is becoming more and more popular especially in the calculators. It has a longer life than lead storage cell but is more expensive. It consists of a cadmium electrode (as anode) and a metal grid containing nickel (IV) oxide (as cathode) immersed in KOH solution. The electrode reactions occurring during discharge are as follows:
At anode:
Cd(s)+2OH(aq)Cd(OH)2(s)+2e
At cathode:
NiO2(s)+2H2O+2eNi(OH)2(s)+2OH(aq)
Overall reaction
––––––––––––––––––––––––––––––––––––––––––––Cd(s)+NiO2(s)+2H2OCd(OH)2(s)+Ni(OH)2 ––––––––––––––––––––––––––––––––––––––––––––

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