16. Which of the following statements about the electrolysis of concentrated potassium iodide solution using graphite electrodes is correct?
17. Which metal is used in electroplating cans to store food?
18. Which of the following is a non-electrolyte
19. Which of the following methods CANNOT reduce the pollution from the electroplating industry?
20. Which pair of electrolytes is not inert?
21. Which primary cell has the longest life?
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