EMF of Ni-Cd battery is dependent on the concentration of:

C d (O H)_{2}

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N i (O H)_{2}

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O H^{-}

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None of these

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Solution

The correct option is D None of these
The nickelcadmium battery (Ni-Cd battery) is a type of rechargeable battery using nickel oxide and metallic cadmium as electrodes.
The net redox change
$N i O_{2} (s) + C d (s) + 2 H_{2} O \to N i (O H)_{2} (s) + C d (O H)_{2} (s)$
As all species are solid so it doesnt possess any ionic concentrations and $E_{c e l l}$ will not depend on any specie.

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