CBSE Class 12 · 2016 · Delhi · Redox Reactions and ElectrochemistryShort Answer

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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 the Apollo Space Programme?
iii) Which cell is used in automobiles and inverters?
iv) Which cell does not have a long life?

Answer: (i) Mercury cell (ii) Fuel cell (iii) Lead storage cell (iv) Dry cell

Solution

(i) Hearing aids: mercury cell (constant voltage, small size).
(ii) Apollo Space Programme: H

_{2}

–O

_{2}

fuel cell.
(iii) Automobiles and inverters: lead storage cell.
(iv) Short life: dry cell (the acidic NH

_{4}

Cl corrodes the zinc container even when unused).

CBSE Class 12 Board · 2016 · Delhi · Subjective

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