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Consider the following statements about expressing hardness.
1. It is usually quoted as calcium carbonate equivalent.
2. Several national degree scales exist and differ from one another.
3. A hardness figure is meaningful without stating its unit.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

The first two are correct. The third is exactly the trap, since French, German and English degrees are all different and a bare number can be wrong by a factor of two. Every specification should name its scale explicitly.

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