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Why do calcium ions make water hard but ...

Why do calcium ions make water hard but sodium ions do not ?

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MODERN PUBLICATION-HYDROGEN-Competition file (Objective Questions) (Multiple Choice Questions from Competitive Examinations)
  1. Which of the following is formed by the action of water on Na2 O2 ?

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  2. In transforming 1 mole of PbS to PbSO4 the volume of '10 volume ' H2 O...

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  3. Why do calcium ions make water hard but sodium ions do not ?

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  4. Which of the following undergoes reduction with H(2)O(2) in an alkalin...

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  5. The normality of 30 volume H2 O2 is

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  6. Very pure hydrogen (99.9%) can be made by which of the following proce...

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  7. Commerical sample of H2 O2 is labeled as 10 V. its % strength is nearl...

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  8. In which of the following reactions H2 O2 acts as a reducing agent ? ...

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  9. The molecular fomula of a commercial resin used for exchanging ions in...

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  10. From the following statements regarding H2O2, choose the incorrect sta...

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  11. The various types of hydrides and examples of each type are given belo...

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  12. Which one of the following statement about water is false?

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  13. Water gas is produced by

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  14. The volume of oxygen liberated at STP from 15 mL of 20 volume H2 O2 is

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  15. Which of the following ions will cause hardness in water ?

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  16. Hydrogen peroxide oxidises [Fe(CN)6]^(4-) to [Fe(CN)6]^(3-) in acidic...

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  17. The volume strength of 1 M H2 O2 is (molar mass of H2 O2 = 34 g "mol"^...

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  18. The isotopes of hydrogen are :

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  19. The temporary hardness of a water sample is due to compound X. Boiling...

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  20. the hardness of a water sample (in terms of Equivalents of CaCO(3)) ...

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