Shapes of Ions Quiz

1. What does VSEPR stand for?

a) Valence Shell Electron Pair Repulsion
b) Valence State Electron Positioning Rule
c) Variable Shell Electron Potential Rule
d) Valence System Energy Pair Rotation

2. What is the shape of the ammonium ion, NH₄⁺?

a) Trigonal planar
b) Tetrahedral
c) Linear
d) Trigonal pyramidal

3. What causes an ion such as ClF₂⁻ to have a bent shape?

a) It has one lone pair and two bonding pairs
b) It has two lone pairs and two bonding pairs
c) The chlorine atom is double bonded to fluorine
d) Lone pairs repel less strongly than bonding pairs

4. The shape of the Tetrahydridoaluminate ion AlH₄^- is .

5. What is the bond angle in a linear ion such as CO₂?

a) 90°
b) 109.5°
c) 120°
d) 180°

6. In the VSEPR model, lone pairs repel bonding pairs than bonding pairs repel each other.

7. The shape of the hydronium ion (H₃O⁺) can be described as:

a) Linear
b) Bent
c) Trigonal planar
d) Trigonal pyramidal

8. What is the shape of the Tetrachloroiodate(III) ion, ICl₄⁻?

a) Trigonal pyramidal
b) Tetrahedral
c) Octahedral
d) Square planar

9. Which statement correctly describes electron pair repulsion?

a) Lone pair–lone pair repulsion is weakest
b) Lone pair–bonding pair repulsion is strongest
c) Bonding pair–bonding pair repulsion is strongest
d) All types of repulsion are equal

10. How many regions of electron density surround the central atom in SF₄?

a) 3
b) 4
c) 5
d) 6

11. What is the shape of the SF₄ ion predicted by VSEPR theory?

a) Seesaw
b) T-shaped
c) Square planar
d) Trigonal bipyramidal

12. The octahedral shape is associated with how many bonding pairs?

a) 4
b) 5
c) 6
d) 8

13. The nitrate ion, NO₃⁻ is a flat molecular ion which is resonanced stabilised, what type of shape does it have?

a) Trigonal planar
b) Pyramidal
c) T-shaped
d) Bent

14. Lone pairs reduce bond angles compared with the ideal shape because they:

a) repel other electron pairs more strongly than bonding pairs do
b) are closer to the bonding atoms
c) occupy less space than bonding pairs
d) are further from the nucleus

15. The ideal bond angle in an octahedral ion such as [Fe(H₂O)₆]³⁺ is degrees.