Figure: Particle diagrams before and after hydrogen reacts with chlorine

Which balanced equation is represented by the figure?
H2+2Cl2→2HCl\mathrm{H_{2}} + 2\mathrm{Cl_{2}} \rightarrow 2\mathrm{HCl}H2+2Cl2→2HCl
2H+2Cl→2HCl2\mathrm{H} + 2\mathrm{Cl} \rightarrow 2\mathrm{HCl}2H+2Cl→2HCl
H2+Cl2→2HCl\mathrm{H_{2}} + \mathrm{Cl_{2}} \rightarrow 2\mathrm{HCl}H2+Cl2→2HCl
H2+Cl2→H2Cl2\mathrm{H_{2}} + \mathrm{Cl_{2}} \rightarrow \mathrm{H_{2}Cl_{2}}H2+Cl2→H2Cl2
230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.