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An exhausted zeolite bed is regenerated using

  • A.dilute sulphuric acid
  • B.dilute sodium hydroxide
  • C.hot water at boiler pressure
  • D.a 10 per cent brine solution

Answer: D

The high sodium concentration drives the exchange backwards, displacing the accumulated calcium and magnesium as their chlorides, which are washed to waste. Acid and alkali are used to regenerate ion exchange resins, not zeolite.

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