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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 flashI had been asked this question in an interview for job.My doubt stems from Electrochemistry in division Electrochemistry of Chemistry – Class 12

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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