Which one of the following is a redox reaction?
Correct answer: C. 2Na + Cl2 → 2NaCl
- A. NaCl + AgNO3 → NaNO3 + AgCl
- B. 2Cl- → Cl2 + 2e-
- C. 2Na + Cl2 → 2NaCl
- D. Na + 1e- → Na
Explanation
The oxidation number of sodium increases from 0 (on the reactants side) to +1 (on the products side), hence sodium is being oxidised. The oxidation number of chlorine decreases from 0 (on the reactants side) to -1 (on the products side), hence chlorine is being reduced. Therefore, we can say that 2Na + Cl2 → 2NaCl is a redox reaction .
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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