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Which of the following appliances would not use sodium hydroxide as an electrolyte in their mercury cells?

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in Chemistry – Class 12 by (188k points)
Which of the following appliances would not use sodium hydroxide as an electrolyte in their mercury cells?

(a) Calculators

(b) Hearing aids

(c) Electronic watches

(d) Photographic cameras with a flash

I had been asked this question in an interview for job.

My doubt stems from Electrochemistry in division Electrochemistry of Chemistry – Class 12

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Best answer
The correct option is (d) Photographic cameras with a flash

Explanation: Sodium hydroxide cells have nearly constant voltage at low discharge currents whereas potassium hydroxide cells provide a constant voltage at high discharge currents. Therefore, sodium hydroxide cells are ideal for calculators, hearing aids and electronic watches whereas potassium hydroxide cells are ideal for photographic cameras with a flash.

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