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Which will produce hard water ?...

Which will produce hard water ?

A

Saturation of water with `CaCO_(3)`

B

Saturation of water with `MgCO_(3)`

C

Saturation of water with `CaSO_(4)`

D

Addition of `Na_(2)SO_(4)` to water

Text Solution

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The correct Answer is:
C
Alkaline earth metal salts cause hardness. Temporary hardness is caused by soluble Ca and Mg hydrogen carbonates. Calcium and magnesium sulphates and chlorides cause permanent harnedd.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 05-Paper 1 (Physics & Chemistry)
  1. 20.0 kg of N(2)(g) and 3.0 kg of H(2)(g) are mixed to produce NH(3)(g)...

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  2. For a first order reaction, the ratio of t(1//2) to t(3//4) is

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  3. Which will produce hard water ?

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  4. Which is tribasic acid?

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  5. Which of the following has the highest bond energy?

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  6. The highest oxidation state is exhibited by the transition metals with...

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  7. The correct IUPAC name of the following. are, respectively

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  8. Absolute ether is

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  9. The system that forms maximum boiling azeotrope is CS(2), acetone

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  10. Ionic compounds are formed most easily with

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  11. The function of salt bridge is

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  12. During the kinetic study of the reaction, 2A+BtoC+D, following resul...

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  13. The available space occupied by spheres of equal size in three dimensi...

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  14. The final step for the extraction of copper from copper from copper py...

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  15. In case of nitrogen, NCl(3) is possible but not NCl(5) while in case o...

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  16. Arrange the following ions in the order of decreasing X-O bond length ...

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  17. Treatment of calcium carbide with water gives

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  18. Which of the following has highest boiling point?

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  19. The order of osmotic prssure of equimolar solutions of BaCl(2),NaCl an...

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  20. 'If a system A is in thermal equilibrium with B and B is in thermal eq...

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