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How is sodium hexametaphosphate useful i...

How is sodium hexametaphosphate useful in removing the permanent hardness of water?

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What is permuitit? How is it useful in removing permanent hardness of water?

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Explain the methods used for the removal of temporary hardness of water.

Permanent hardness of water can be removed only by chemical methods. Write the name of any one salt responsible for the permanent hardness of water.

Distinguish between : Temporary and permanent hardness of water.

Write the name and formula of four minerals which cause permanent hardness of water.

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A N EXCEL PUBLICATION-HYDROGEN-QUESTION BANK
  1. Permanent hardness of water can be removed only by chemical methods. W...

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  2. Permanent hardness of water can be removed only by chemical methods. S...

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  3. How is sodium hexametaphosphate useful in removing the permanent hardn...

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  4. Suggest a disadvantage of hard water.

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  5. Hard water contains calcium and magnesium salts. Therefore it does not...

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  6. How will you remove the hardness from the water by using washing soda?

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  7. WhIch method is more suitable to get pure demineralised water?

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  8. Hydrogen peroxide is stored in plastic vessels in dark why?

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  9. What is coal gasification?

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  10. About 18% of the total production of dihydrogen is from coal. How is d...

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  11. Write any two uses of dihydrogen.

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  12. Water is an amphoteric substance. Justify

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  13. Hydrides are binary compounds of hydrogen with other elements. Give on...

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  14. H2O2 is a bleaching agtent. Why?

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  15. Complete the following reaction. (Zn(s) + NaOH(aq) rarr^(heat) ………………....

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  16. In a seminar, if you are asked to present a paper on hydrogen economy,...

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  17. Syn gas' is a mixture of .....

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  18. A sample of river water does not give lather with soap easily when it ...

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  19. Draw the structure of a hydrogen peroxide molecule.

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  20. Hydrogen reacts with most of the metals and non metals to form hydride...

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