Chemical bonding Book Back Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 25
    9 x 1 = 9
  1. In which of the following Compounds does the central atom obey the octet rule?

    (a)

    XeF4

    (b)

    AlCl3

    (c)

    SF6

    (d)

    SCl2

  2. In the molecule O= C = OB, the formal charge on OA, C and OB are respectively.

    (a)

    -1, 0, +1

    (b)

    +1, 0, -1

    (c)

    -2, 0, +2

    (d)

    0, 0, 0

  3. The ratio of number of sigma (σ) and pi (л) bonds in 2- butynal is

    (a)

    8/3

    (b)

    5/3

    (c)

    8/2

    (d)

    9/2

  4. Assertion: Oxygen molecule is paramagnetic.
    Reason: It has two unpaired electron in its bonding molecular orbital.

    (a)

    both assertion and reason are true and reason is the correct explanation of assertion

    (b)

    both assertion and reason are true but reason is not the correct explanation of assertion

    (c)

    assertion is true but reason is false

    (d)

    Both assertion and reason are false

  5. In ClF3, NF3 and BF3 molecules the chlorine, nitrogen and boron atoms are

    (a)

    sp3 hybridised

    (b)

    sp3 ,sp3 and sp2 respectively

    (c)

    sp2 hybridised

    (d)

    sp3d, sp3 and sp hybridised respectively

  6. Which of these represents the correct order of their increasing bond order

    (a)

    \(C_2

    (b)

    \(C_2^{2-}

    (c)

    \(O_2^{2-}

    (d)

    \(O_2^{2-}

  7. Hybridisation of central atom in PClinvolves the mixing of orbitals

    (a)

    s, px, py, dx2 , dx2-y2

    (b)

    s, px . py, pxy . dx2-y2

    (c)

    s, px, py, pz, dx2-y2

    (d)

    s, px, py, dxy, dx2-y2

  8. Shape and hybridisation of IF5 are

    (a)

    Trigonal bipyramidal, Sp3d2

    (b)

    Trigonal bipyramidal, Sp3d

    (c)

    Square pyramidal, Sp3d2

    (d)

    Octahedral, Sp3d2

  9. In which of the following molecules /ions BF3, NO2-, H2O the central atom is sp2 hybridised?

    (a)

    NH2- and H2O

    (b)

    NO2- and H2O

    (c)

    BF3 and NO2-

    (d)

    BF3 and NH2-

  10. 8 x 2 = 16
  11. Draw the M.O diagram for oxygen molecule calculate its bond order and show that O2 is paramagnetic.

  12. Draw MO diagram of CO and calculate its bond order.

  13. Discuss the formation of N2 molecule using MO Theory

  14. Hydrogen gas is diatomic where as inert gases are monoatomic – explain on the basis of MO theory.

  15. What is Polar Covalent bond? explain with example.

  16. Explain VSEPR theory. Applying this theory to predict the shapes of IF7, and SF6.

  17. CO2 and H2O both are triatomic molecule but their dipole moment values are different. Why?

  18. Describe fajan's rule.

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