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2AgNO3 + Ni -> Ni(NO3)2 + 2Ag
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2K + 2H2O --> 2KOH + H2
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2C2H2 + 5O2 -> 4CO2 + 2H2O
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MgCO3 -> MgO+ CO2
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8Cu + S8 -> 8CuS
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HCl + NaOH -> H2O + NaCl
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C4H8 + 6O2 -> 4CO2 + 4H2O
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2Ag + S ---> Ag2S
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2Mg + O2 -> 2MgO
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AgNO3 + NaCl -> NaNO3 + AgCl
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