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Chemical Bonding & Molecular Structure Test - 1

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Chemical Bonding & Molecular Structure Test - 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following molecules has sp3d3 hybridisation and one lone pair of electrons?

    Solution

    1) IF7 has 7 shared pairs, no lone pairs and sp3d3 hybridisation.
    2) XeF6 has 6 shared pairs, one lone pair and sp3d3 hybridisation.
    3) SF6 has 6 shared pairs, no lone pairs and sp3d2 hybridisation.
    4) ClF5 has 5 shared pairs, one lone pair and sp3d2 hybridisation.

     

  • Question 2
    1 / -0

    Which of the following statements is false?

    Solution

    At maximum, a water molecule can have is 4 hydrogen bonds.

  • Question 3
    1 / -0

    Which of the following species contains four bond pairs and two lone pairs around the central atom?

    Solution

    XeF4 has 4 bond pairs and 2 lone pairs around the central atom (sp3d2 hybridization).

     

  • Question 4
    1 / -0

    Which of the following conversions involves a change in both hybridisation and geometry?

    Solution

    AlCl3 : sp2 hybridisation, trigonal planar geometry

    AlCl4- : sp3 hybridisation, tetrahedral geometry

    NH3 : sp3 hybridisation, trigonal pyramidal geometry

    NH4+ : sp3 hybridisation, tetrahedral geometry

    AlCl3 : sp2 hybridisation, trigonal planar geometry

    AlCl4- : sp3 hybridisation, tetrahedral geometry

    PCl3 : sp3 hybridisation, trigonal pyramidal geometry

    PCl4+ : sp3 hybridisation, tetrahedral geometry

     

  • Question 5
    1 / -0

    In which of the following changes is an electron added to antibonding (π*) orbital?

    Solution

    O2+ (15 electrons) : (σ1s)2, (σ*1s)2, (σ2s)2, (σ*2s)2, (σ2pz)2,(π2px)2=( π2py)2, (π*2px)1

    O2 (16 electrons) : (σ1s)2, (σ*1s)2, (σ2s)2, (σ*2s)2, (σ2pz)2, (π2px)2=( π2py)2, (π*2px)1=( π*2py)1

    During change of O2+ to O2, an electron is added to π* orbital.

     

  • Question 6
    1 / -0

    Which of the following statements is NOT true?

    Solution

    On ionization of NO to form NO+, the nitrogen-oxygen bond becomes stronger (the bond order increases from 2.5 in NO to 3 in NO+ cation).

     

  • Question 7
    1 / -0

    In allene CH2 = C = CH2, hybridisations of carbon atoms are ______, respectively.

    Solution

    Hybridisations of respective carbon atoms are identified correctly.

     

  • Question 8
    1 / -0

    Which of the following matchings is not correct?

    Solution

    XeF4 has 4 shared pairs and two lone pairs; sp3d2 hybridisationl; and square planar geometry.

     

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