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JEE Main & Advanced Chemistry Hydrogen & Its Compounds / हाइड्रोजन और इसके यौगिक Question Bank Critical Thinking Questions

  • question_answer
    Polyphosphates are used as water softening agents because they [IIT JEE (Screening) 2002]

    A) Form soluble complexes with anionic species

    B) Precipitate anionic species

    C) Forms soluble complexes with cationic species

    D) Precipitate cationic species

    Correct Answer: C

    Solution :

    Polyphosphates (sodium hexametaphosphates, sodium tripolyphosphate or STPP) from soluble complexes with \[C{{a}^{+2}},\ M{{g}^{+2}}\] present in hard water.


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