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What are silicones ?...

What are silicones ?

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Simple silicones consist of chains in which alkyl or phenyl groups occupy the remaining bonding positions on each silicon. They are hydrophobic (water repellant) in nature.
`(-overset(|)underset(|)(Si)-O-)_(n)`
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NCERT-THE P-BLOCK ELEMENTS -EXERCISE
  1. What are silicones ?

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  2. Discuss the pattern of variation in the oxidation states of (a)B to TI...

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  3. How can you explain higher stability of BCI(3) as compared to TICI(3)?

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  4. Why does boron trifluoride behave as a Lewis acid?

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  5. Consider the compounds, BCl(3) and C Cl(4).How will they behave with w...

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  6. Is boric acid a protic acid? Explain.

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  7. Explain what happens when boric acid is heated.

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  8. Describe the shapes of BF(3) and BH(4)^(ө). Assign the hybridisation o...

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  9. Write reaction of justify amphoteric nature of aluminium.

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  10. What are electron-deficient compounds? Are BCl(3) and SiCl(4) electron...

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  11. Write the resonance structure of CO(3)^(2-) and HCO(3)^(ө).

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  12. What is the state of hybridisation of carbon in (a)CO(3)^(2-), (b) dia...

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  13. Explain the difference in properties of diamond and graphite on the ba...

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  14. Rationalise the given statements and give chemical reactions. a. Lea...

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  15. Suggest reasons why the B–F bond lengths in BF(3) (130 pm) and BF(4 )^...

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  16. If B-Cl bond has a dipole moment, explain why BCl(3) molecule has zero...

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  17. AlF(3) is insoluble in anhydrous HF but dissolves on addition of NaF. ...

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  18. Suggest a reason as to why CO is poisonous.

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  19. How is excessive content of CO(2) responsible for global warming?

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  20. Explain structures of diborane and boric acid.

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  21. What happens when (a) Borax is heated strongly, (b) Boric acid is ...

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