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Permanent hardness of water is due to th...

Permanent hardness of water is due to the presence of

A

Bicarbonates of sodium and potassium

B

Chlorides and sulphates of sodium and potassium

C

Chlorides and sulphates of calcium and magnesium

D

Bicarbonates of calcium and magnesium

Text Solution

Verified by Experts

The correct Answer is:
C
Permanent hardness of water is due to chlorides and sulphates of calcium and magnesium.
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ERRORLESS-HYDROGEN-NCERT BASED QUESTION (Water or Hydride of Oxygen)
  1. Water softening by Clarke's process uses

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  2. Which of the following will determine whether the given colourless liq...

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  3. Permanent hardness of water is due to the presence of

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  4. Which of the following will cause softening of hard water ?

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  5. By adding which of the following process, permanent hardness of water ...

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  6. Permutit is technical name given to

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  7. Sodium sulphate is soluble in water but barium sulphate is insoluble b...

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  8. When two ice cubes are pressed over each other, they unite to form one...

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  9. What is formed when calcium carbide reacts with heavy water?

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

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  11. Which of the following can effectively remove all types of hardness of...

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  12. What is true about ice ?

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

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  14. Ordinary water is not used as a moderator in nuclear reactors because

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  15. The solubility of an ionic compound is compared in heavy and simple wa...

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  16. The process used for the removal of hardness of water is

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  17. Which of the following compounds is used for water softening ?

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  18. Ozone is used for purifying water because

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  19. The maximum prescribed concentration of cadmium in drinking water in p...

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  20. Which of the following acid is formed when SiF(4) reacts with water ?

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