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p - Block Elements II - 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. What is inert pair effect?

  2. Chalcogens belongs to p-block. Give reason.

  3. Explain why fluorine always exhibit an oxidation state of -1?

  4. Give the oxidation state of halogen in the following.
    a) OF2
    b) O2F2
    c) Cl2O3
    d) I2O4

  5. What are interhalogen compounds? Give examples.

  6. Why fluorine is more reactive than other halogens?

  7. Give the uses of helium.

  8. What is the hybridisation of iodine in IF7? Give its structure?

  9. How is nitrogen prepared from liquid air?

  10. Give two uses of nitric acid

  11. Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

  12. Arrange the following as indicated below:
    (i) F2' Cl2, Br2, I2 - increasing bond dissociation enthalpy.
    (ii) HF, HCI, HBr, HI - increasing acidic strength.

  13. Account for the following:
    (i) O-O bond lengths in ozone molecule are identical.
    (ii) Most of the reactions in fluorine are exothermic.

  14. Explain Why inspite of nearly the same electronegativity, nitrogen forms hydrogen bonding while chlorine does not - Give reason.

  15. Why hydrides of oxygen is a liquid whereas hydride of sulphur is a gas?

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