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Secondary Cells

Now he tried ...

Question

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

It consists of a cadmium electrode (as anode)

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At anode:

C d (s) + 2 O H^{-} (a q) \to d (O H)_{2} (s) + 2 e^{-}

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At cathode:

N i O_{2} (s) + 2 H_{2} O + 2 e^{-} \to N i (O H)_{2} (s) + 2 O H^{-} (a q)

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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:
$C d (s) + 2 O H^{-} (a q) \to d (O H)_{2} (s) + 2 e^{-}$
C At cathode:
$N i O_{2} (s) + 2 H_{2} O + 2 e^{-} \to N i (O H)_{2} (s) + 2 O H^{-} (a q)$
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:
$C d (s) + 2 O H^{⊖} (a q) \to C d (O H)_{2} (s) + 2 e^{-}$
At cathode:
$N i O_{2} (s) + 2 H_{2} O + 2 e^{-} \to N i (O H)_{2} (s) + 2 O H^{⊖} (a q)$
Overall reaction
$- -------------------------------------------- - C d (s) + N i O_{2} (s) + 2 H_{2} O \to C d (O H)_{2} (s) + N i (O H)_{2} - -------------------------------------------- -$

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