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DP IB Chemistry: SL

Topic Questions

Home / IB / Chemistry: SL / DP / Topic Questions / 4. Chemical Bonding & Structure / 4.2 Resonance, Shapes & Giant Structures / Multiple Choice: Paper 1


4.2 Resonance, Shapes & Giant Structures

Question 1

Marks: 1

The following equation shows the dissociation equilibrium of PCl5

PCl5(g) → PCl3(g)  + Cl2(g) 

The percentage yield of PCl3 varies with temperature. 

At 160°C PCl3 yield is 13% and at 300°C yield is100%. 

Which of the following rows is correct?

 

The reaction is

Shape of PCl3 molecule

A

exothermic

trigonal pyramidal

B

exothermic

trigonal planar

C

endothermic

trigonal pyramidal

D

endothermic

trigonal planar

    Choose your answer
      

    Question 2

    Marks: 1

    Boron trifluoride, BF3, reacts with trimethylamine, (CH3)3N, to form a compound of formula (CH3)3N.BF3

    How may this reaction be written using 3D structures to show  the shapes of the reactants and products?q2-1_14-2_ib_sl_medium_mcq

    Choose your answer
      

    Question 3

    Marks: 1

    Which of the following statements about graphite are correct? 

    1.    The carbon atoms are joined together by three covalent bonds
    2.    Graphite contains delocalised electrons
    3.    The C-C-C bond angle is 109.5o
    • I and II only

    • I and III only

    • II and III only

    • I, II and III

    Choose your answer
      

    Question 4

    Marks: 1

    Which statement below shows the correct information about diamond and silicon?

    • Diamond is macromolecular and silicon is simple molecular

    • The bond angles in the two structures are the same

    • The bond lengths are longer in C-C than in Si-Si

    • Diamond and silicon both conduct electricity due to delocalised electrons in their structure

    Choose your answer
      

    Question 5

    Marks: 1

    How many lone pairs of electrons are there around the chlorine atom in a molecule of chlorine trifluoride, ClF3?

    • 1

    • 2

    • 3

    • 0

    Choose your answer
      

    Question 6

    Marks: 1

    Which one of these species has a bond angle of 120°?

    • H3O+  

    • TlBr32-

    • BCl3

    • NH3 

    Choose your answer
      

    Question 7

    Marks: 1

    Which of the following statements about silicon dioxide is correct? 

    1.    Silicon dioxide forms a giant covalent network
    2.    Each silicon atom is covalently bonded to four oxygen atoms
    3.    Silicon dioxide molecules are V-shaped
    • I and II only

    • I and III only

    • II and III only

    • I, II and III

    Choose your answer
      

    Question 8

    Marks: 1

    Ibuprofen is an anti-inflammatory drug that is used for treating pain, fever and inflammation. The structure is shown below.q8_4-2_ib_sl_medium_mcq 

    Ibuprofen

     What are the correct bond angles for a and b?

     

    a

    b

    A

    120o

    120o

    B

    107o

    109.5o

    C

    109.5o

    120o

    D

    120o

    109.5o

      Choose your answer
        

      Question 9

      Marks: 1

      Which of the following molecules obeys the octet rule?

      • BF3

      • HCN

      • BeCl2

      • CS2

      Choose your answer
        

      Question 10

      Marks: 1

      Which row in the table is correct?

       

      Shape of diamond structure

      Melting point of buckminsterfullerene

      Bond angle in graphene

      A

      Square planar

      Relatively high

      90o

      B

      Tetrahedral

      Relatively low

      107o

      C

      Trigonal Planar

      Relatively high

      109.5o

      D

      Tetrahedral

      Relatively low

      120o

        Choose your answer