AS CHEMISTRY

SHAPES OF MOLECULES

MULTIPLE CHOICE QUESTIONS


1.  Which one of the following is a linear molecule?


BeCl2
BF3
CH4
CCl4

 


2.  Which of the following is the correct order for the electron pair repulsions?


lone pair-lone pair < bond pair-bond pair < bond pair-lone pair
lone pair-lone pair < bond pair-lone pair < bond pair-bond pair
bond pair-bond pair < bond pair-lone pair < lone pair-lone pair
bond pair-bond pair < lone pair-lone pair < bond pair-lone pair

 


3.  Which of the following is not a trigonal planar molecule?


AlCl3
AlH3
BF3
NH3

 


4.  Which of the following is tetrahedral?


BF3
CH4
NH3
SF6

 


5.  The shape of a molecule with six bond pairs and no lone pairs is...


hexahedral
octahedral 
tetrahedral
trigonal bipyramidal

 


6.  Which one of following molecules does not have any three of its atoms in a straight line?


BeCl2
CO2
H2O
SF6

 


7.  The bond angles in a molecule of boron trifluoride are...


90
107
109.5
120

 


8.  The bond angles in PF5 are...


all 72
90 and 120
109.5 and 120
109.5 and 90

 


9.  Which of the following species has a shape based on two lone pairs and two bond pairs?


NH3
NH2-
NH4+
PH3

 


10.  The shape of carbon dioxide is described as...


linear
octahedral
tetrahedral
trigonal planar

 


11.  The H-N-H bond angles in the ammonium ion NH4+ are...


greater than the H-N-H bond angles in ammonia
identical H-N-H bond angles in ammonia
107
less than the H-N-H bond angles in ammonia

 


12.  The shape of XeF4 molecules is based on them having...


4 bond pairs
4 bond pairs and 1 lone pair
4 bond pairs and 2 lone pairs
4 bond pairs and 4 lone pairs

 


13.  Which one of the following molecules/ions is square planar?


CH4
NH4+
PCl4+
XeF4

 


14.  The molecule whose shape is based on lone pairs is...


CH4
CO2
H2O
SF6

 


15.  The ion whose shape is not based on lone pairs is...


NH4+
NH2-
H3O+
PCl4-

 


16.  Which of the following statements about ammonia molecules is not true?


they possess a lone pair
the H-N-H bond is 107
they are pyramidal in shape
they are tetrahedral in shape

 


17.  Which of the following statements about SO2 molecules is true?


the O=S=O bond angle is 180
their shape is based on then having two lone pairs and two double bond pairs
their shape is based on then having one lone pair and two bond bond pairs
they are trigonal planar

 


18.  Which of following best describes the shape of SO3 molecules?


linear
square planar
tetrahedral
trigonal planar

 


19.  In which of the following changes are the bond angles in the second species smaller than the first?


H2O and H3O+
CH4 and CO2
NH4+ and NH3
AlCl4- and AlCl3

 


20.  The shape of BrF3 is best described as...


linear
pyramidal
trigonal planar
T-shaped