Chemical Bonding Book Back Questions

9th Standard

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. Number of valence electrons in carbon is

    (a)

    2

    (b)

    3

    (c)

    4

    (d)

    5

  2. ____________compounds have high melting and boiling points.

    (a)

    Covalent

    (b)

    Coordinate

    (c)

    Ionic

    (d)

    Coordinate

  3. Oxidising agents are also called as____________because they remove electrons form other substances.

    (a)

    electron donors

    (b)

    electron acceptors

    (c)

    electron donors

    (d)

    Ionic

  4. Elements with stable electronic configurations have eight electrons in their valence shell. They are__________

    (a)

    Halogens

    (b)

    Metals

    (c)

    Noble gases

    (d)

    non metals

  5. The property which is characteristics of an Ionic compound is that

    (a)

    it oen exists as gas at room temperature

    (b)

    it is hard and brittle

    (c)

    it undergoes molecular reactions

    (d)

    it has low melting point

  6. 1 x 1 = 1
  7. Complete the table give below.

    Element Atomic number Electron distribution Valence electrons Lewis dot structure
    Lithium 3      
    Boron 5      
    Oxygen 8      
  8. 1 x 2 = 2
  9. Complete the crossword using the clues
    Left to right:

    1) pair of electrons which do not take part in bond formation
    2) reaction in which both oxidation and reduction takes place
    3) rule which says about eight electrons in outermost shell
    Top to bottom:
    a) bond formed by transfer of electrons from one atom to another
    b) ion with positive charge
    c) energy required to remove the most loosely bound electron from an isolated gaseous atom of an element
    d) loss of electron
    (lonepair, redox, octet, ionic, cation, ionisation,oxidation)

  10. 4 x 3 = 12
  11. How do atoms attain Noble gas electronic configuration

  12. Write a note on different types on bonds?

  13. Draw the electron distribution diagram for the formation of Carbon di oxide (C02) molecule.

  14. An atom X with atomic number 20 combines with atom Y with atomic number 8. Draw the dot structure for the formation of the molecule XY.

  15. 2 x 5 = 10
  16. List down the differences between Ionic and Covalent compounds.

  17. Identify the incorrect statement and correct them.
    a. Like covalent compounds, Coordinate compounds also contain charged particles (ions), so they are good conductors of electricity.
    b. Ionic bond is a weak bond when compared to Hydrogen bond.
    c. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms.
    d. Loss of electrons is called Oxidation and Gain of electron is called Reduction.
    e.The electrons which are not involved in bonding are called valence electrons.

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