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The sodium sulphur battery must be maintained at about 300 degrees Celsius because

  • A.its reaction rate is otherwise too fast
  • B.its electrolyte would freeze and crack the case
  • C.its capacity falls with rising temperature
  • D.its electrodes must be molten to conduct

Answer: D

Both the sodium and the sulphur are liquid at the operating temperature and the beta alumina electrolyte conducts sodium ions only when hot. The heating parasitic load is a real cost of keeping such a battery on standby.

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