3.1.3.5 Shapes of simple molecules + ions

Which species has a shape that is influenced by the presence of one or more lone pairs of electrons around the central atom?

• AlCl₃

• ClF₃

• IF₆⁺

• PCl₆^–

Which species has one or more bond angle(s) of 90°?

• CH₄

• NH₄⁺

• ClF₄⁻

• AlCl₄⁻

Which is the most likely bond angle around the oxygen atom in ethanol?

• 104.5°

• 109.5°

• 120°

• 180°

Which of these species is not planar?

• HCHO

• CH₃⁺

• CH₃OH

• C₂H₄

Which of these species has a trigonal planar structure?

• PH₃

• BCl₃

• H₃O⁺

• CH₃⁻

In which one of the following species is the shape influenced by the presence of one or more lone pairs of electrons?

• NH₂^-

• NH₄⁺

• [CH₃NH₃]⁺

• [Co(NH₃)₆]²⁺

Which one of the following molecules is not planar?

• BF₃

• NCl₃

• C₂H₄

• HCHO

Which one of the following ions has three lone pairs of electrons around the central atom?

• BF₂^-

• NH₂^-

• ClF₂^-

• PF₆^-

Which one of the following is the most likely value for the bond angle α shown in the diagram of SF₄?

• 118°

• 101°

• 90°

• 88°

Which one of the following molecules or ions is pyramidal in shape?

• BF₃

• CH₃⁺

• CH₃^-

• SF₃^-