p - Block Elements - II Two Marks Questions

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

  3. What are interhalogen compounds? Give examples.

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

  5. How is nitrogen prepared from liquid air?

  6. Give two uses of nitrogen

  7. How is ammonia prepared in the lab?

  8. Discuss the oxidising power of fluorine

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

  10. How would you account for the following? The electron gain enthalpy with negative sign is less for oxygen than that of sulphur.

  11. There is a huge difference between the melting and boiling points of oxygen and sulphur. Why?

  12. Give the reason for bleaching action of Cl2.

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

  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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