Chemistry-
General
Easy

Question

Temporary hardness may be removed from water by adding

  1. C a C O subscript 3 end subscript    
  2. C a left parenthesis O H right parenthesis subscript 2 end subscript    
  3. C a S O subscript 4 end subscript    
  4. H C l    

The correct answer is: C a left parenthesis O H right parenthesis subscript 2 end subscript

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