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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-4

  • question_answer
    Permanent hardness of water is due to the presence of

    A)  calcium bicarbonate

    B)  sulphates and chlorides of calcium and magnesium

    C)  sulphates and chlorides of sodium and potassium

    D)  Nitrates of sodium and potassium

    Correct Answer: B

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