PIO A-Level Chem Bonding Revision

Which molecule has a permanent dipole?

• NCl3
• CCl4
• PF5
• SF6

Which molecule can accept an electron pair during the formation of a coordinate bond?

• NH3
• AlCl3
• SiH4
• PCl3

Which substance has significant electron delocalisation?

• graphite
• iodine
• sodium chloride
• tetrachloromethane

What happens when water is vaporised?

• Covalent bonds break within molecules.
• Intermolecular forces are overcome.
• The enthalpy of the molecules decreases.
• The disorder of the molecules decreases.

Which statement about the shapes of ions is not correct?

• [CoCl4]2– is square planar.
• NH4+ is tetrahedral.
• [Co(H2NCH2CH2NH2)3]2+ is octahedral.
• [Co(H2O)6]2+ is octahedral.

The equation for a reaction is AsH3 + H+ → AsH4+. What type of interaction forms in this reaction?

• Co-ordinate bond
• Dipole–dipole force
• Hydrogen bond
• Ionic bond

Which is not responsible for conducting electricity?

• The sodium ions in molten sodium chloride
• The electrons between layers of carbon atoms in graphite
• The bonding electrons in a metal
• The lone pair electrons in liquid water molecules

Which compound has the highest boiling point?

• CH3COCH2CH3
• CH3CH2CH2CH2OH
• CH3CH2CH2CHO
• CH3CH2CH2CH2CH3

Which substance has no delocalised electrons?

• graphite
• methylbenzene
• poly(propene)
• sodium

Which pair of reagents reacts to form a tetrahedral complex?

• CoCl2(aq) and concentrated NH3(aq)
• CuSO4(aq) and concentrated NH3(aq)
• CuSO4(aq) and sodium ethanedioate(aq)
• FeCl3(aq) and concentrated HCl(aq)