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Secondary Cells

The Zinc/ Sil...

Question

The Zinc/ Silver oxide cell is used in hearing aid and electrical watches. In this cell

A

Zinc ions are reduced .

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B

Silver is reduced

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C

Zinc is oxidized

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D

No electrolyte is used.

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Solution

The correct option is C
Zinc is oxidized

In this cell, zinc is oxidized and silver oxide is reduced.

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Similar questions

Q. The zinc/silver oxide cell is used in electric watches. The reaction is as follows

Z n^{+ 2} + 2 e ⟶ Z n; E^{0} = - 0.76 V

A g_{2} O + H_{2} O ⟶ 2 A g + 2 O H^{-}; E^{0} = 0.344 V

F

96500 m o l^{- 1}

Δ G^{0}

of the cell is:

Q. Why Mercury cell is used in hearing aids?

Q. Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell.

Q. From the given cells:
Lead storage cell, Mercury cell, Fuel cell and Dry cell
Answer the following:
(i) Which cell is used in hearing aids?
(ii) Which cell was used in Apollo Space Programme?
(iii) Which cell is used in automobiles and inverters?
(iv) Which cell does not have long life?

Q. Which of the given statements for mercury cell are incorrect?
(i) Mercury cell is suitable for low current devices like hearing aids, watches, etc.
(ii) It consists of zinc-mercury amalgam as anode and a paste of HgO and carbon as the cathode.
(iii) The electrolyte is a paste of

Z n (O H)_{2}

K O_{2}

.
(iv) The electrode reactions for the cell are
At anode:

Z n (H g) + H_{2} O \to Z n O_{(s)} + 2 O H^{-} + 2 e^{-}

H g O + H_{2} O + 2 e^{-} \to H g_{(l)} + 2 O H^{-}

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