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CBSE Important Questions

CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Atomic Structure and Chemical Bonding

Atomic Structure and Chemical Bonding

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  1. State Heinsberg uncertainity principle?
  2. State de Broglie's principle?
  3. State the physical significance of y2?
  4. Define an atomic orbital. What does angular quantum number tell about an orbital?
  5. Which quantum numbers determine the energy of an atomic orbital?
  6. What is meant by the statement " Energy of an electron is quantised"
  7. What sub-shell would be found in the shell with n = 4?
  8. What does the magnetic quantum number l determines about an elec tron?
  9. What do you uderstand by bonding molecular orbitals?
  10. Write an example of a neutral molecule which is isoelectronic to ClO-?


  1. State Hunds rule of maximum multiplicity. Can it be applied for filling of electrons in the molecular orbitals?
  2. Explain diamagnetic character of fluorine molecule by M.O.T.?
  3. Calculate the uncertainity in the velocity of a wagon of mass 1000 kg. whose position while in motion is known to an accuracy of + -10 m.
  4. Calculate the Kinetic energy of a moving electron which has a wave length of 4.8 pm.
  5. Calculate the wavelength of an electron moving with a velocity of 1000 m/s


  1. [a] Write down the ground state electronic configuration of F2+
    [b] The kinetic energy of a sub-atomic particle is 4.55X10-25 J Calcu late the frequency of the particle wave.
  2. Calculate the de Broglie wavelength of an electron travelling with a speed equal to 1% of speed of light.
    How is the wave nature of electron significant for stydying surface structure of solid.
  3. Write the molecular orbital configuration of the following
    [a] O2- [b] C2
    Calculate their bond orders.
  4. Calculate the wavelength associated with a beam of electrons accelerated by an electric field to a velocity of 107 m/s
  5. The ionisation energy of sodium is 494.7 kj/mol Calculate the wave length of the electromagnetic ratiation which is just sufficient to ionise the sodium atom.
  1. Atomic Structure and Chemical Bonding
  2. Solid State
  3. Solutions
  4. Thermodynamics
  5. Electrochemistry
  6. Chemical Kinetics
  7. P Block Elements
  8. D and F Block Elements
  9. Nuclear Chemistry
  10. Stereo Chemistry
  11. Organic Functional Group I
  12. Organic Functional Group II and III
  13. Surface Chemistry
  14. Chemistry In Every Day Life
  15. Polymers
  16. Practice Paper No.1
  17. Practice Paper No.2
  18. Practice Paper No.3
  19. Practice Paper No.4


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