10th Class Science Sample Paper Science Olympiad Model Test Paper-3

  • question_answer
    Which one of the following is used for removing permanent hardness of water?

    A) \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\]

    B) \[NaCI\]

    C) \[CaOC{{l}_{2}}\]

    D) \[NaOH\]

    E) None of these

    Correct Answer: A


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