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Chemical A is used for water softening t...

Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When `CO_(2)` is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A ?

A

`CaCO_(3)`

B

`CaO`

C

`Ca(OH)_(2)`

D

`Ca(HCO_(3))_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`Ca(OH)_(2)` is used for the softening of temporary hard water.
`Ca(OH)_(2)(aq)rarr underset("cloudiness")(CaCO_(3)(s))+H_(2)O(l)`
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DISHA PUBLICATION-HYDROGEN-Exercise - 2 : Concept Applicator
  1. Metal hydrides are ionic, covalent or molecular in nature. Among LiH, ...

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  2. Calgon used as water softener is

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  3. Chemical A is used for water softening to remove temporary hardness. A...

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  4. Which of the following is not true?

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  5. The volume strength of 1*5 N H(2)O(2) solution is

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  6. 20 volume H(2)O(2) solution has a strength of about

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  7. Which of the following is wrong about H(2)O(2) ? It is used

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  8. The hydride ion H^(-) is a stronger base than its hydroxide ion OH^(-)...

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  9. Which of the following reactiona is an example of use of water gas...

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  10. Heavy water reacts respectively with CO(2),SO(3), P(2)O(5) and N(2)O(5...

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  11. Which of the following is formed by the action of water on sodium pero...

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  12. The percentage by weight of hydrogen in H(2)O(2) is

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  13. The correct order of O - O bond length in O(2)H(2)O(2) and O(3) is

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  14. Two ice cubes are pressed over each other until they unite to form one...

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  15. The molarity of a 100 mL solution containing 5.1 g of hydrogen peroxid...

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  16. When water is dropped over sodium peroxide, the colourless gas produce...

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  17. 10 L of hard water required 0.56 g of lime (CaO) for removing hardness...

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  18. The adsorption of hydrogen by metals is called :

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  19. Which of the following statements is correct?

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  20. Which of the following statements do not define the characteristic pro...

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