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Exothermic and oxidation
Electrolytic decomposition
Double displacement reaction
Synthesis
1. \(H_{2(g)}+Cl_{2(g)}→2HCl_{(g)}\):
 
2. \(NaOH+HCl→NaCl+H_2O\):
 
3. \(CH_4 + 2O_2 → CO_2 + 2H_2O + Heat\):
 
4. \(2NaCl → 2Na + Cl_2\) :