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Polyhosphates are used as water softeni...

Polyhosphates are used as water softening agents because they

A

1. form soluble complexes with anionic species

B

2. precipitate anionic species

C

3. form soluble complexes with cationic species

D

4. precipitate cationic species

Text Solution

Verified by Experts

The correct Answer is:
C
Polyphosphates such as sodium hexa meta phosphate combines with cations `Ca^(2)+` or `Mg^(2+)` to form soluble complexes
`2Ca^(2+)+Na_(4)[Na_(4)(PO_(3_6))rarr4Na^(2+)+Na_(2)Ca_(2)(PO_(3_6))`
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MODERN PUBLICATION-HYDROGEN-MULTIPLE CHOICE QUESTION (LEVEL-II)
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  2. In which of the following reaction H(2)O(2) is acting as a reducing ag...

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  3. The pH of D(2)O and H(2)O at 298 k is

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  4. Metal hydrides are ionic covalent or molecular in nature among LiH ,...

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  5. Which of the following hydrides is electron precise hydride

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  6. The oxide which gives H(2)O(2) on treatment with dilute acid is

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  7. Which of the following equations depict the oxidising nature of H(2)O...

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  8. When sodium peroxide is treated with dilute suplhuric acid we get …………...

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  9. Consider the reaction A H(2)O(2)+2HIrarrI(2)+2H(2)O B HOCI+H(2)O(2...

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  10. Which of the following reactions is an example of use of water gas i...

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  11. Elements of which of the following group of periodic table do not form...

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  12. Which of the following reaction increases production of dihydrogen fr...

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  13. Why do calcium ions make water hard but sodium do not

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  14. Ortho and para hydrogen have

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  15. Amongst H(2)O H(2)S,H(2) Se and H(2) Te the one with the highest ...

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  16. Polyhosphates are used as water softening agents because they

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  17. Which one of the following processes will pro duce hard water

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  18. The reagent commonly used to determine hardness of water titrimetrica...

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  19. One mole of magnesium nitride on reaction with excess of water gives

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  20. In context with the industrial preparation of hydrogen from water gas...

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