A student makes three statements about covalent molecules.
Statement 1: O2\mathrm{O_{2}}O2 and CO2\mathrm{CO_{2}}CO2 both contain double covalent bonds
Statement 2: HCl\mathrm{HCl}HCl contains two shared pairs, because each atom needs one more electron
Statement 3: in CH4\mathrm{CH_{4}}CH4, the carbon atom has eight electrons in its outer shell
Which statements are correct?
1 and 3 only
1 only
2 and 3 only
1, 2 and 3
53 exam-style questions on Edexcel GCSE Chemistry 2.4 Covalent bonding, covering 2.4.1 Covalent bonding and simple molecules. Each one has a worked solution and a mark scheme showing where the marks go.