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Account for the following observations: ...

Account for the following observations: i) The density of ice is lower than that of water. ii) Hard water doesn't give ready lather with soap.

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A N EXCEL PUBLICATION-HYDROGEN-QUESTION BANK
  1. The efficiency of a boiler is found to decrease when boiler scales are...

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  2. Density of ice is lower than that of water.

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  3. Account for the following observations: i) The density of ice is lower...

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  4. Justify the position of hydrogen in the periodic table

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  5. Hydrogen peroxide is an important chemical used in pollution control t...

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  6. Draw the structure of hydrogen peroxide

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  7. Explain with suitable chemical equation, why hydrogen peroxide is stor...

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

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

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

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  11. Suggest a disadvantage of hard water.

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

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

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

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

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  16. What is coal gasification?

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

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  18. Write any two uses of dihydrogen.

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  19. Water is an amphoteric substance. Justify

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

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