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A primary cell differs from a secondary cell in that a primary cell

  • A.delivers alternating rather than direct current
  • B.cannot usefully be recharged
  • C.can be recharged many times
  • D.has no electrolyte between its electrodes

Answer: B

Correct answer: cannot usefully be recharged

A primary cell’s reactions are not practically reversible: the products cannot be converted back to reactants by passing current, and attempting it generates gas and heat. A secondary cell is built so that the same reaction runs both ways, which imposes real constraints on the chemistry and the construction.

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