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  3. 6th Class
  4. Science
  5. Water

6th Class Science Water Question Bank Water

  • question_answer
    Hardness of water is due to presence of

    A) salts of calcium           

    B) salts of magnesium

    C) Both (a) and (b)          

    D) None of these

    Correct Answer: B

    Solution :

       


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