If the total hardness and alkalinity of a sample of water are 300 mg/I and 100 mg/I $(C a C O_{3} s c a l e)$ respectively, then its carbonate and non-carbonate hardness (in units of mg/I) will be respectively

- 1
  
  100 and 200
- 2
  
  400 and 300
- 3
  
  100 and 400
- 4
  
  400 and zero

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