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Chemical Bonding and Molecular Structure Test 14

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Chemical Bonding and Molecular Structure Test 14
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  • Question 1
    1 / -0

    There is no S-S bond in

    Solution


  • Question 2
    1 / -0

    Which of the following molecules are expected to exhibit intermolecular H-bonding

    I. Acetic acid

    II. o-nitrophenol

    III. m-nitrophenol

    IV. o-boric acid

    Solution



  • Question 3
    1 / -0

    A : tetracyanomethane                           B : Carbondioxide

    C : Benzene                                           D : 1, 3-buta-di-ene

    Ratio of σ and π bond is in order:

    Solution

    (A) Tetra cyanomethane


  • Question 4
    1 / -0

    Which of the following models best describes the bonding within a layer of the graphite structure ?

    Solution

  • Question 5
    1 / -0

    In  , the shape is square planer. The number of bond pair-lone pair repulsion at 90° are :

    Solution


    ⇒ No of bond pair-lone pair repulsion = 8

  • Question 6
    1 / -0

    In which of the following molecules / ions all the bonds are not of equal length.

    Solution




  • Question 7
    1 / -0

    The critical temperature of water is higher than that of O2 because the H2O molecules has :

    Solution

    ⇒ H2O is polar molecule
    ⇒ Hence  H2O has higher critical temp

  • Question 8
    1 / -0

    Compound with maximum ionic character is formed from :

    Solution

    for maximum ionic character,
    * IE of cation must be less
    * EA of anion must be larger
    ⇒ CS and  F
    ⇒ (B)

  • Question 9
    1 / -0

    Mg2C3 reacts with water forming propyne, C3 4- has

    Solution

  • Question 10
    1 / -0

    Which of the following has a geometry different from the other three species (having the same geometry)?

    Solution




  • Question 11
    1 / -0

    Which of the following molecule does not have open book structure.

    Solution



  • Question 12
    1 / -0

    The hybridisation and geometry of BrF3 molecules are :

    Solution

  • Question 13
    1 / -0

    Pick out the incorrect statement ?

    Solution

    (A) N2 B.O = 3 B.O α stability
    N2+ B.O = 2.5
    Correct Statement
    (B) O2 ⇒ B.O = 2
    O2 ⇒ B.O = 2.5 ⇒ Correct Statement

    (D) NO+, B.O. = 3
    NO, B.O = 2.5
    = Correct statement

  • Question 14
    1 / -0

    Ethanol has a higher boiling point than dimethyl ether though they have the same molecular weight. This is due to :

    Solution


    ⇒ due to intermolecular H-bond, it has higher b.p. than CH3OCH3

  • Question 15
    1 / -0

    A simplified application of MO theory to the hypothetical ‘molecule’ OF would give its bond order as

    Solution

  • Question 16
    1 / -0

    Which of the following contains electrovalent and covalent bonds ?

    Solution


  • Question 17
    1 / -0

    Which of the following species is paramagnetic ?

    Solution


  • Question 18
    1 / -0

    Bond order of Be2 is

    Solution

  • Question 19
    1 / -0

    The volatility of HF is low because of :

    Solution

    due to H–bond,
    HF has Low volatility

  • Question 20
    1 / -0

    Which of the following sets of characteristics leads to the increase in solubility of ionic substances ?

    Solution

    High dipole moment and strong attraction by ions means that they can form intermolecular Hydrogen bond with water molecules. High solvation energy means that when the compound is dropped into water, then when the compound forms H-bond with water, then a high amount of energy is released. This is favourable to solubility as more heat is released, more the compound becomes soluble.

  • Question 21
    1 / -0

    Dipole-induced dipole interactions are present in which of the following pairs?

    Solution

    Dipole-induced dipole interaction is present in the pair in which the first species is polar and the other is non-polar.
    H2O and alcohol both are non-polar so there exist dipole-dipole interactions in between them.
    Cl2 and CCl4 both are non-polar so there exists induced dipole -induced dipole interactions in between them. Similarly is true for SiCl4 and He atoms pair.

    HCl is a polar molecule, whereas He atoms are non-polar, so in between them dipole-induced dipole interactions exist.

  • Question 22
    1 / -0

    Which one of the following conversions involve change in both hybridization and shape?

    Solution

    Hybridisation -

    The process of mixing of atomic orbitals belonging to the same atoms of slightly different energies so that a redistribution of energy takes place between them  resulting in the formation of new set of orbital of equivalent energies and shape is called hybridisation.- wherein The new orbitals thus formed are called hybrid orbitals.

  • Question 23
    1 / -0

    The molecule is not having 3c-2e bond.

    Solution




  • Question 24
    1 / -0

    Among KO2, AlO-2 ,BaO2 and NO+2 unpaired electron is present in :

    Solution

     contain one unpaired electron so paramagnetic

  • Question 25
    1 / -0

    Which has maximum dipole moment ?

    Solution



  • Question 26
    1 / -0

    Ethanol has a higher boiling point than dimethyl ether though they have the same molecular weight. This is due to :

    Solution


    ⇒ due to intermolecular H-bond, it has higher b.p. than CH3OCH3

  • Question 27
    1 / -0

    Arrange the following in order of decreasing boiling point :

    (I) n-Butane (II) n-Butanol (III) n-Butyl chloride (IV) Isobutane

    Solution

    (I) H3C—CH2—CH2—CH3 n-butane




    II > III >I > IV
    As H-bond>d Interaction
    > st. chain > Branch chain

  • Question 28
    1 / -0

    Which of the following compounds would have significant intermolecular hydrogen bonding ?

    HF, CH3OH, N2O4, CH4

    Solution


    ⇒ due to intermolecular H-bond, it has higher b.p. than CH3OCH3

  • Question 29
    1 / -0

    For H2O2, H2S, H2O and HF , the correct order of decreasing extent of hydrogen bonding is :

    Solution

  • Question 30
    1 / -0

    A simplified application of MO theory to the hypothetical `molecule' OF would give its bond order as

    Solution

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