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    Chemistry
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    NEET Chemistry : Chemical Bonding and Molecular Structure

    Multiple Choice Questions

    31.

    Four diatomic solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

    • straight O subscript 2 superscript minus space less than thin space NO space less than thin space straight C subscript 2 superscript 2 minus end superscript space less than thin space He subscript 2 superscript plus
    • NO less than thin space straight C subscript 2 superscript 2 minus end superscript space less than thin space straight O subscript 2 superscript minus space less than thin space He subscript 2 superscript plus
    • straight C subscript 2 superscript 2 minus end superscript space less than space He subscript 2 superscript plus less than thin space NO thin space less than thin space straight O subscript 2 superscript minus
    • straight C subscript 2 superscript 2 minus end superscript space less than space He subscript 2 superscript plus less than thin space NO thin space less than thin space straight O subscript 2 superscript minus
    Answer
    • 32.

    Bond dissociation enthalpy of H2, Cl2 and HCl and 434, 242 and 431 kJ mol-1 respectively.  Enthalpy of formation of HCl is 

    • 93 kJ mol-1

    • -245 kJ mol-1

    • -39 kJ mol-1

    • -39 kJ mol-1

    Answer
    • 33.

    In the hydrocarbon

    straight C with 6 below straight H subscript 3 space minus straight C with 5 below straight H equals straight C with 4 below straight H minus straight C with 3 below straight H subscript 2 minus straight C with 2 below identical to straight C with 1 below straight H

    The state of hybridization of carbon 1, 3, and 5 are in the following sequence

    • sp2, sp, sp3

    • sp, sp3, sp2

    • sp, sp2, sp3

    • sp, sp2, sp3

    Answer
    • 34.

    The correct order of C-O bond length among CO, CO32-, CO2 is,

    • CO2<  CO32-<  CO

    • CO <  CO32-<  CO2

    • CO32- <CO2 <CO

    • CO32- <CO2 <CO

    Answer
    • 35.

    The correct order of increasing bond angles in the following triatomic species is 

    • NO subscript 2 superscript minus space less than thin space NO subscript 2 superscript plus space thin space less than space NO subscript 2
    • NO subscript 2 superscript minus space less than thin space NO subscript 2 space less than thin space NO subscript 2 superscript plus
    • NO subscript 2 superscript plus space less than thin space NO subscript 2 space less than thin space NO subscript 2 superscript minus
    • NO subscript 2 superscript plus space less than thin space NO subscript 2 space less than thin space NO subscript 2 superscript minus
    Answer
    • 36.

    From the following bond energies:

    H-H bond energy: 431.37 kJ mol-

    C=C  bond energy: 606.10 kJ mol-

    C- C bond energy: 336.49 kJ mol-

    C-H bond energy: 410.50 kJ mol-

    Enthalpy for the reaction,


    will be


    • 1523.6 kJ  mol-

    • -243.6 kJ mol-

    • -1200. kJ mol-

    • -1200. kJ mol-

    Answer
    • 37.

    The angular shape of ozone molecule (O3) consists of 

    • 1 sigma and 2 pi bonds

    • 2 sigma and 2 pi bonds

    • 1 sigma and 1 pi bonds

    • 1 sigma and 1 pi bonds

    Answer
    • 38.

    The state of hybridization of C2, C3, C5 and C6 of the hydrocarbon,


    is in the following sequence

    • sp, sp3, sp2 and sp3

    • sp3, sp2, sp2 and sp

    • sp,sp2,sp2 and sp3

    • sp,sp2,sp2 and sp3

    Answer
    • 39.

    In which of the following molecules/ions BF3, NO2-, NH2- and H2O, the central atom is sp2 hybridised?

    • NO2- and NH2-

    • NH2- and H2O

    • NO2- and H2O

    • NO2- and H2O

    Answer
    • 40.

    According to MO theory which of the following lists ranks the nitrogen species in terms of increasing bond order?

    • straight N subscript 2 superscript minus space less than space straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript
    • straight N subscript 2 superscript 2 minus end superscript less than space straight N subscript 2 superscript minus space less than space straight N subscript 2
    • straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript space less than straight N subscript 2 superscript minus
    • straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript space less than straight N subscript 2 superscript minus
    Answer
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