P- Block Elements

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Questions and Answers
  • 1. 
    Which of the following pairs of ions are iso-electronic and iso-structral?
    • A. 

    • B. 

    • C. 

    • D. 

  • 2. 
    Which of the following element can be involved in pπ-dπ bonding?
    • A. 

      Carbon

    • B. 

      Nitrogen

    • C. 

      Phosphorous

    • D. 

      Boron

  • 3. 
    Maximum co-valency of nitrogen is:
    • A. 

      3

    • B. 

      4

    • C. 

      5

    • D. 

      6

  • 4. 
    Strong reducing behavior of H3PO2 is due to:
    • A. 

      Low oxidation state of phosphorous

    • B. 

      Presence of two –OH groups and one P-H group

    • C. 

      Presence of one –OH group and two P-H group

    • D. 

      High electron gain enthalpy of phosphorous

  • 5. 
    In solid state PCl5 is a:
    • A. 

      Covalent solid

    • B. 

      Octahedral structure

    • C. 

      Ionic solid with [PCl6]+ octahedral and [PCl4]- tetrahedral

    • D. 

      Ionic solid with [PCl4]+ tetrahedral and [PCl6]- octahedral

  • 6. 
    The oxidation state of central atom in the anion of compound NaH2PO2 will be:
    • A. 

      + 1

    • B. 

      + 3

    • C. 

      + 5

    • D. 

      - 3

  • 7. 
    A brown ring is formed in the ring test for ion. It is due to the formation of: - ProProfs
    A brown ring is formed in the ring test for ion. It is due to the formation of:
    • A. 

      [Fe (H2O) 5(NO)] 2+

    • B. 

      FeSO4.NO2

    • C. 

      [Fe (H2O) 4(NO) 2]2+

    • D. 

      FeSO4.HNO3

  • 8. 
    The molecule having smallest bond angle is
    • A. 

      AsCl3

    • B. 

      SbCl3

    • C. 

      PCl3

    • D. 

      NCl3

  • 9. 
    Water is oxidized to oxygen by:
    • A. 

      ClO2

    • B. 

      KmnO4

    • C. 

      H­2O2

    • D. 

      F2

  • 10. 
    The shape of XeO2F2 molecule is:
    • A. 

      Trigonal bi-pyramidal

    • B. 

      Square planar

    • C. 

      Tetrahedral

    • D. 

      See-saw shaped

  • 11. 
    Which one of the following is present as an active constituent in bleaching powder for bleaching action?
    • A. 

      CaCl2

    • B. 

      CaOCl2

    • C. 

      Ca(OCl)2

    • D. 

      CaO2Cl

  • 12. 
    Which of the following structures is the most preferred and hence of lowest energy for SO3?
    • A. 

    • B. 

    • C. 

    • D. 

  • 13. 
    Identify the correct order for their acidic strength: - ProProfs
    Identify the correct order for their acidic strength:
    • A. 

      I > II> III

    • B. 

      II > I> III

    • C. 

      III > II> I

    • D. 

      I > III> II

  • 14. 
    Which of the following noble gas is used in miner’s camp?
    • A. 

      Argon

    • B. 

      Krypton

    • C. 

      Helium

    • D. 

      Neon

  • 15. 
    Which of the following fluoride of Xe has zero dipole moment?
    • A. 

      XeF2

    • B. 

      XeF6

    • C. 

      XeF4

    • D. 

      Both (a) and (c)

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