Answer:
1. 2K(s) + Cl2(g) → 2KCI(s)
2. 4NH3(g) → 2N2(g) + 6H2(g)
3. 2AgNO3(aq) + CaCl2(aq) → 2AgCl(s) + Ca(NO3)2(aq)
4. CH4(g) + 2O₂(g) → CO2(g) + 2H₂0(g)
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