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Which of the following equations describes a single-replacement reaction? (Points : 5) H2 (g) + Br2 (g) 2HBr (g) Cl2 (g) + 2KI (s) 2KCl (s) + I2 (g) 2Na (s) + Cl2 (g) 2NaCl (s) 2N2O5 (g) O2 (g) + 4NO2 (g)
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