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p - Block Elements I - Two Marks Study Materials

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    15 x 2 = 30
  1. Write a short note on anamolous properties of the first element of p-block

  2. Describe briefly allotropism in p- block elements with specific reference to carbon

  3. Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF3.

  4. Give the uses of Borax

  5. What is catenation ? describe briefly the catenation property of carbon

  6. Write a note on Fisher tropsch synthesis

  7. Give the structure of CO and CO2.

  8. What is oxo process?

  9. What happens to CO2 when dissolved in water?

  10. Give the formula of chlorosilazanes. Explain its preparation from SiCI4.

  11. Name the building block of zeolites. Why zeolites have high porosity?

  12. (i) Silicones are used for making waterproof fabrics. Give reason.
    (ii) Diamond - bad conductor of electricity.

  13. What is crystal field splitting?

  14. Which one is more soluble in diethyl ether, anhydrous Alcl3 or hydrated Alcl3? Explain in terms of bonding.

  15. Starting from Sicl4, prepare the following in steps not exceeding the number given in parentheses.
    (i) Silicon
    (ii) Linear silicon containing methyl groups only
    (iii) Na2SiO3

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