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What are silicones ?...

What are silicones ?

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DINESH PUBLICATION-P BLOCK ELEMENTS (GROUP 13 AND 14 )-Concept based
  1. Diagonal Relationship Between Beryllium And Aluminium

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  2. White fumes appear around the bottle of anhydrous aluminium chloride. ...

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  3. Boron is unable to form BF(6)^(3-)– ion. Explain.

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  4. Why is boric acid considered as a weak acid ?

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  5. In elements of group 14. (a) which forms the most acidic oxide (b)...

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  6. [SiF(6)]^(2-) is a well known compound but [SiCl(6)[^(2-) is not. Expl...

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  7. Diamond is covalent, yet it has high melting point. Why ?

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  8. What are alums? Give the chemcial formulae of the following alums:

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  9. Which importan t properties of aluminium are responsible for its great...

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  10. Account for the foolowing: (a) Aluminium is not prepared by carrying...

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  11. Carbon does not form any complesses while slicon particlipates in the ...

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  12. Why is SnCl(2) more easly formed than SnCl(4)?

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  13. PbCl(4) exists but PbBr(4) and PbI(4) do not because of

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  14. Point out the false statements in the following: (a) Lead shows allo...

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  15. (a) Why is boric acid considered as a weak acid. (b) Discuss the str...

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  16. Write the reactions of B(2)H(6) with (a) H(2)O (b) O(2) (c) NH(3).

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  17. What are silicones ?

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  18. Explain structures of diborane and boric acid.

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  19. At room temperature, CO(2) is a gas while SiO(2) is a solid because

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  20. (a) W hat do ou mean by catensation? (b) C Cl(4) cannot be hydrolyse...

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