Which molecule contains a double covalent bond?
HCl\mathrm{HCl}HCl
O2\mathrm{O_{2}}O2
H2\mathrm{H_{2}}H2
CH4\mathrm{CH_{4}}CH4
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.