General
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Chemistry-

Which of the following pair of ions makes the water hard

Chemistry-General

  1. N H subscript 4 end subscript superscript plus end superscript comma   C l to the power of minus end exponent    
  2. K to the power of plus end exponent comma   H C O subscript 3 end subscript superscript minus end superscript    
  3. C a to the power of 2 plus end exponent comma   N O subscript 3 end subscript superscript minus end superscript    
  4. N a to the power of plus end exponent comma   S O subscript 4 end subscript superscript 2 minus end superscript    

    Answer:The correct answer is: K to the power of plus end exponent comma   H C O subscript 3 end subscript superscript minus end superscriptH C O subscript 3 end subscript superscript minus end superscript is main reason of temporary hardness of wate

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