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Polyphosphates are used for softening ag...

Polyphosphates are used for softening agents because they

A

form soluble complexes anionic species

B

precipitate anionic species

C

form soluble complexes with cationic species

D

precipitate cationic species

Text Solution

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The correct Answer is:
c
Polyphosphates `(` sodium hexametaphosphates, sodium tripolyphosphate or `STPP)` from soluble complexes with `Ca^(+2), Mg^(+2)` is present in hard water.
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Knowledge Check

  • Polyphosphates are used as water softening agents because they

    A
    form soluble complexes with anionic species
    B
    precipitate anionic species
    C
    form soluble complexes with cotionic species
    D
    precipitate cationic species

  • Polyphosphates are used as water softening agents because they

    A
    form soluble complexes with anionic speciews
    B
    precipitate anionic species
    C
    form soluble complexes with cationic species
    D
    precipitate cationic species.

  • Polyphosphates llike sodium hexametaphosphate (calgon) are used as water softening agents because they

    A
    form soluble complexes with anionic species
    B
    precipitate anionic species
    C
    form soluble complexes with cationic species
    D
    precipitate cationic species.
    • A2Z-HYDROGEN-Section D - Chapter End Test
    1. Polyphosphates are used for softening agents because they

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    2. The critical temperature of water is higher than that of O(2) because ...

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    3. One mole of calciium phosphide on reaction with excess water gives

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    4. When zeolite, which is hydrated sodium aluminate silicate, is treated ...

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    5. Pick the odd one out

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    6. Hydrogen gas will not reduce:

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    7. HCl is added to following oxides. Which one would give H(2)O(2) ?

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    8. Which of the following pairs will not produce dihydrogen gas ?

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    9. The amount of H(2)O(2) present in 1L of 1.5 NH(2)O(2) solution is

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    10. Hydrogen is evolved the action of cold dilute HNO(3) on :

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    11. Hydrogen can behave as a metal

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    12. D(2)O is preferred to H(2)O, as a moderator, in nuclear reactors becau...

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    13. Out of the two allotropic forms of dihydrogen, the form with lesser mo...

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    14. Saline hydrides react explosively with water, such fires can be exting...

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    15. When temporary hard water containing Mg(HCO(3))(2) is boiled, the ppt....

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    16. Permanent hardness due to Mg^(2+) ions is best removed by

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    17. Plumbosolvency is a health hazard in the transporatatino of

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    18. Hardness producing salt, whose solubility in water decreases with rise...

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    19. A sample of water containing some dissolved table sugar and common sal...

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    20. Water obtained by purification with organic ion exchange resins is

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