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Give reasons for the following: Dried fr...

Give reasons for the following:
Dried fruit plastic bags sold in the market are filled with nitrogen gas instead of air.

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Give reasons for the following statements: Grain is a fruit not seed.

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MODERN PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. The metals Na, k and Ca react with hydrogen to form hydride but other ...

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  2. Give reasons for the following: Aluminium easily combines with oxygen ...

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  3. Give reasons for the following: Dried fruit plastic bags sold in the m...

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  4. Discuss briefly the following: Radioactive wastes

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  5. Discuss briefly the following: Ultraviolet B

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  6. Discuss briefly the following: Ultraviolet B

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  7. Give reasons for the following: Gold and silver often occur in native ...

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  8. Give reasons for the following: Blue colour of copper sulphate solutio...

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  9. Give reasons for the following: Sodium metal is stored under kerosene ...

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  10. Give reasons for the following: Silver does not displace hydrogen from...

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  11. Write a short notes on: Calcination.

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  12. Write a short notes on: Thermite process.

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  13. Write a short notes on: Froth floatation process.

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  14. An ore on heating in air from sulphur dioxide. Name the process than c...

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  15. Distinguish between: alloy and amalgam

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  16. What is difference between minerals and ores?

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  17. Distinguish between roasting and calcination. Which of these two is us...

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  18. An alloy of yellw colour is made of two metals a and b.when alloy a w...

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  19. Give six characterstic differences between metals and non-metals.

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  20. Discuss the different methods of preparation and properties of dioxyge...

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