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Rain water is soft, but after passing ov...

Rain water is soft, but after passing over hills and mountains it gets converted into hard water-why?

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CHHAYA PUBLICATION-HYDROGEN-SHORT ANSWER TYPE
  1. Write the reactions for: preparation of D(2)O(2) from potassium persu...

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  2. Between deionised water and distilled water which one is more pure and...

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  3. Rain water is soft, but after passing over hills and mountains it gets...

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  4. Why is Na(2)O(2) used for purifying air in submarines and in crowded ...

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  5. Comment on the reactions of dihydrogen with Chlorine

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  6. Comment on the reactions of dihydrogen with sodium

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  7. Comment on the reactions of dihydrogen with copper (II) oxide.

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  8. An ionic alkali metal hydride has covalent character to some extent an...

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  9. Sodium reacts with dihydrogen to form a crystalline ionic solid. It is...

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  10. Why is sea water not used in boilers?

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  11. The values of melting point, enthalpy of vaporisation and viscosity of...

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  12. How will you prepare heavy water from ordinary water? Explain its prin...

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  13. Can phosphorus form PH(5) with its outer electronic configuration of 3...

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  14. How will you prepare dihydrogen from HNO(3) ?

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  15. Do you think the hydrides of N, O and F will have lower boiling points...

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  16. KF reacts with HF to form the compound, KF-2HF. Discuss the probable s...

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  17. Calculate the amount of energy liberated due to combustion of 4g dihyd...

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  18. Under what conditions, water reacts with calcium cyanamide and what ar...

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  19. Discuss the industrial preparation of H(2)O(2) from 2ethylanthraquinol...

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  20. Why H(2)O(2) is a better oxidant than water?

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