Question Pool Chemical Bonding

Chemical Bonding - SAMAGRA Question Pool & Answers | Class 9 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Chemistry Chemical Bonding

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Qn 1.

Molecular formulae of a few molecules are given.

a)Write down the electronic configurations of the elements present in them.

Find the type of chemical bonding present in these molecules

i. MgO  ii. CH4  iii. H2   iv. N2

(Atomic number; Mg-12 , O-8 , H-1, C-6,N-7)



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Qn 2.

The molecular formula of calcium chloride is CaCl2 .It is an ionic compound. (Atomic number : , chlorine 17. )

a) What is the charge of calcium ion in CaCl?

b) How many electrons are present in the outermost shell of calcium ion ?



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Qn 3.

Which of the following elements have attained stability. Justify your answer.

Oxygen (Z=8)

Argon (Z=18)

Calcium (Z=20)

Neon (Z=10)



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Qn 4.

Molecular formula of aluminium chloride is AlCl3 . Write down the molecular formulae of the oxide and fluoride of aluminium. (Valency O=2,F=1)



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Qn 5.

The atomic number of element A is 12 and that of B is 8. (Symbols are not real)

a) Find the valencies of these elements by writing their electronic configurations

b)Write down the molecular formula of the compound formed when A and B combine together.



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Qn 6.

The molecular formula of aluminium chloride is AlCl3. Find the valencies of component elements in it.



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Qn 7.

The Molecular formula of magnesium chloride is MgCl2 .

a) Write down the electronic configuration of the component elements in this compound.

b) Find the valencies of these elements.

(Atomic number: Mg = 12 ,Cl =17 )



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Qn 8.

Match the following

 

A

B

C

Property

Ionic compounds

Covalent compounds

State

Exist in solid, liquid and gaseous states.

Solid state

Solubility in water

Generally insoluble in water.

Conduct electricity in molten and aqueous states

Electrical conductivity

Generally not a conductor of electricity

Generally soluble in water.

 

  • Answer)

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    Qn 9.

    Complete the given table

     

    Element

    Atomic number

    Electronic configuration

    Valency

    Na

    11

    .........(a)..........

    1

    Al

    .......(b)........

    2,8,3

    ..........(c).........

    Cl

    17

    .......(d)........

    ........(e)........

    O

    8

    .........(f).........

    2

    • Answer)

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      Qn 10.

      Magnesium fluoride is an ionic compound.

      ( Atomic number: Mg= 12, F=9)

      a) Identify the cation in this compound. How will you represent it?

      b) Write down any one characteristic property of magnesium fluoride as an ionic compound.



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      Qn 11.

      The chemical bond formed as a result of the sharing of electrons between the combining atoms is called a covalent bond.

      Analyse the diagrams given below and answer the following questions.

      IMAGE

      a)Compare the given covalent bonds and write a short note on it.

      b)Illustrate the chemical bond present in nitrogen molecule(N2)

      (Hint: Atomic number of Nitrogen is 7 )



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      Qn 12.

      Analyse the electronic configurations and molecular formulae of elements given below and answer the following questions.

       

      Element

      Electronic configuration

      Na

      2,8,1

      H

      1

      Cl

      2,8,7

      C

      2,6

      Ca

      2,8,8,2

       

      Compound

      Molecular Formula

      Sodium Chloride

      NaCl

      Hydrogen Chloride

      HCl

      Calcium Chloride

      CaCl2

      Carbon tetrachloride

      CCl4

       

      a)Classify the given compounds into Ionic compounds and Covalent compounds

      b)Illustrate the chemical bonding present in CCl4 using Electron dot formula



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      Qn 13.

      Atomic number of Hydrogen is 1 and that of Oxygen is 8.

      a) Represent the chemical bonding in H2O molecule using Electron dot diagram

      b) Water is a polar compound. Give reason?



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      Qn 14.

      Electronegativity values of some elements are given.

      H = 2.20 C = 2.55

      K = 0.82 Mg = 1.31

      O = 3.44 Cl = 3.16

       

      Identify the nature of chemical bond present in the following compounds on the basis of their electronegativity values.

      a) H2O

      b) KCl

      c) MgCl2

      d) CH4

      • Answer)

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        Qn 15.

        Given below are the electronic configurations of certain elements. (Symbols are not real)

         

        A - 2,8,2

        B - 2,8,7

        C - 2,8,6

        D - 2,8,8

        E - 2,8,1

         

        a) Which one of these is the most stable element ?

        b) Which among these donate electrons during bond formation ?

        c) Identify the elements which accept electrons during reactions ?‍

         

        d)Which of these elements are metals?



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        Qn 16.

        Magnesium combines with oxygen to form magnesium oxide.

        (Atomic number:‍ Mg = 12, O = 8)

        a)Which type of chemical bonding is present in magnesium oxide?

        b) Write down the molecular formula of magnesium oxide



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        Qn 17.

        When sodium and Chlorine take part in bond formation ,they attain octet configuration by electron transfer. (Atomic number :‍ Na = 11, Cl = 17 )

        Represent the Electron dot diagram of the above bond formation



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        Qn 18.

        The elements sodium and oxygen undergo chemical bonding to form sodium oxide

        (Hint: Atomic number : sodium-11, Oxygen - 8)

        a) Draw electron dot diagram of the bond formation.

        b) Write down the molecular formula of sodium oxide



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        Qn 19.

        Atomic numbers of a few elements are given(symbols are not real)

        A : 17

        B : 19

        C : 8

        D : 11

        a) Which among them are capable of getting converted into cations during bond formation?

        B) What is the molecular formula of the compound formed when the elements B and C take part in bond formation?



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        Qn 20.

        Using hints given match the following suitably

        (Hints: F=9, O=8, N=7)

         

        A

        B

        F2

        Triple bond

        O2

        Single bond

        N2

        Double bond

        • Answer)

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          Qn 21.

          a) What is the valency of carbon?

          b) How many electrons are needed for carbon to attain octet configuration?

          c) Draw the electron dot diagram of methane (CH4), the compound formed by the combination of Carbon and Hydrogen

           



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          Qn 22.

          N☰N   represents a molecule.

          Choose the type of chemical bonding present here.

          ( Ionic bond,single bond,double bond,triple bond )



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          Qn 23.

          The atomic number of fluorine is 9

          Draw the electron dot diagram of the formation of fluorine molecule by the combination of two fluorine atoms ‍



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          Qn 24.

          Ne - 2, 8

          Ar - 2, 8, 8

          Kr - 2, 8, 18, 8

          The given elements do not take part in chemical reactions usually.

          Why do these elements have stability?Explain on the basis of their electronic configuration .



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          Qn 25.

          Given below are the electronic configurations of a few elements.(symbols are not real)

           

          A - 2,8,8,2    B – 2,8,8

          C– 2,8,1       D – 2,8,7

          a) Which one of these atoms accepts electrons?

          b) Which is the stable element?

          c) Write down the molecular formula of the compound formed when the elements A and D combine together?

          d) Which element has a valency of two ?

           



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          Qn 26.

          Electronegativity values of a few elements are given.

             H – 2.20        Ca – 1.00     O – 3.44

             C – 2.55           Cl – 3.16   Mg – 1.31

          a) Which type of chemical bond is present in the given compounds?

          (i) MgO     (ii) CaCl2      (iii) HCl

          b) Which one of these form a polar compound?



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          Qn 27.

          Electronic configurations of a few elements are given.Analyse them and answer the following questions.

           K - 2,8,8,1              Ar – 2,8,8

          Cl – 2,8,7               Mg – 2,8,2

          a) Which of these elements form cations?

          b) Which element doesnot take part in chemical reactions? Give reason.

          c) Write down the molecular formulae of two compounds that are possible here.



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          Qn 28.

          The elements calcium and oxygen combine to form calcium oxide molecule .(atomic number :calcium -20, oxygen- 8)

          a) Draw the electron dot diagram of the formation of calcium oxide molecule.

          b) Write down the molecular formula of calcium oxide.

          c) What is the valency of calcium?



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          Qn 29.

          Molecular formula of aluminium chloride is AlCl3.( atomic number Al-13,Cl- 17)

          a) Which type of chemical bonding is present in AlCl3?

          b) What is the charge on aluminium ion in AlCl?

          c) What is the valency of chlorine ?

          d)How many electrons are present in the outermost shell of aluminium ion?



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          Qn 30.

          Analyse the table and write down the molecular formulae of the compounds given below

          Element

          Valency

          Mg

          Cl

          Al

          O

          2

          1

          3

          2

           

          a)Magnesium Chloride

          b) Aluminium Oxide



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          Qn 31.

          The figure given below represents the Electron dot diagram of the formation of HCl molecule .

          IMAGE

          a) The formation of chemical bond in HCl molecule is by -------------

          (electron transfer/ electron sharing ‍ )                                  (1)

          b) What is the type of chemical bond  formed here known as? (1)

          c) H-Cl shows polar nature. Why? (2)



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          Qn 32.

          The Electron dot diagram representing the formation of oxygen molecule is given below.

           

          IMAGE

          a) How many pairs of electrons are shared between the oxygen atoms ?

          Mention the type of covalent bond present here? (

          b) Electronic configuration of Nitrogen is 2,5 .Draw the electron dot diagram of the formation of N2 molecule.



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          Qn 33.

          The figure given below represents the Electron dot diagram of the formation of sodium oxide .

          image

          a) What are the valencies of sodium and oxygen.?

          b) Which one of these elements donates electrons ?Which element accepts electrons? 

          c) Identify the type of chemical bond present  in the given molecule 



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          Qn 34.

          The figure given below represents the electron dot diagram of Sodium Chloride formation.

          image

          a) Identify the type of chemical bonding present in sodium chloride

          b) Given the electronic configurations of the elements Mg and F

          Mg - 2,8,2 ; F - 2,7

          When magnesium and fluorine combine,

          i)which element donates its electrons to the other? ‍

          ii)How many electrons are donated ?

          c) Draw the electron dot diagram of the formation of magnesium fluoride . ‍



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          Qn 35.

          1 .              Ar-  2,8,8

          The given element Argon does not take part in chemical reactions.

          a)Which among the following elements undergo chemical reactions forming compounds?. Give reason

          (i) Ca – 2,8,8,2          ii) Ne - 2,8

           

          iii) Kr - 2,8,18,8           iv ) S - 2,8,6

          b) The attractive force that holds together the atoms in a molecule is known as ---------------------------------



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