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Which one of the following statements is correct?

  1. (a)Liquid sodium is employed as a coolant in nuclear reactors
  2. (b)Calcium carbonate is an ingredient of toothpaste
  3. (c)Bordeaux mixture consists of sodium sulphate and lime
  4. (d)Zinc amalgams are used as a dental filling
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Official answer(a) Liquid sodium is employed as a coolant in nuclear reactors