Write the reaction equation: Cl2 – HCl – NaCl – HCl – Cl2

1) Cl2+H2=2HCl
2)HCl+NaOH=NaCl+H2O
3) 2NaCl+H2SO4=Na2SO4 + 2HCl
4) 4HCl+O2=2Cl2+2H2O



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