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A sample of river water does not give la...

A sample of river water does not give lather with soap easily when it is cold, but on heating gives ready lather with soap. Why?

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A N EXCEL PUBLICATION-HYDROGEN-QUESTION BANK
  1. How is sodium hexametaphosphate useful in removing the permanent hardn...

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  2. Suggest a disadvantage of hard water.

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

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

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

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

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  7. What is coal gasification?

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

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  9. Write any two uses of dihydrogen.

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  10. Water is an amphoteric substance. Justify

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

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  12. H2O2 is a bleaching agtent. Why?

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

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

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

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

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  17. Draw the structure of a hydrogen peroxide molecule.

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

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  19. Hydrogen peroxide restore the colour of lead paintings. Give a reason.

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  20. How does the atomic hydrogen torch function for cutting and welding pu...

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