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Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2013)

  • question_answer
    Permanent hardness of water may be removed by the addition of

    A)  potash alum          

    B)  lime

    C)  sodium carbonate     

    D)  potassium permanganate

    Correct Answer: C

    Solution :

    Permanent hardness of water can be removed by the addition of washing soda\[N{{a}_{2}}C{{O}_{3}}\].


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