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Permanent hardness of water can be remov...

Permanent hardness of water can be removed only by chemical methods. Sodium hexametaphosphate is commercially called……………………..

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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.

Write reason for the following: Temporary hardness of water can be removed by boiling.

Water can be boiled more quickly on the top of a mountain. What is called boilling point of a liquid ?

A N EXCEL PUBLICATION-HYDROGEN-QUESTION BANK
  1. Explain with suitable chemical equation, why hydrogen peroxide is stor...

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

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

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

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  5. Suggest a disadvantage of hard water.

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

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

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

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

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  10. What is coal gasification?

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

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  12. Write any two uses of dihydrogen.

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  13. Water is an amphoteric substance. Justify

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

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  15. H2O2 is a bleaching agtent. Why?

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

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

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

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

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  20. Draw the structure of a hydrogen peroxide molecule.

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