For the reaction of sodium bromide with chlorine gas to form sodium chloride and bromine,the appropriate half-reactions are (ox = oxidation and re = reduction):

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The half-reaction for chlorine gas shows that it undergoes oxidation and loses electrons to form chloride ions (Cl-). The half-reaction for sodium bromide shows that it undergoes reduction and gains electrons to form bromide ions (Br-). Therefore, the appropriate half-reactions are ox: Cl2 + 2e- -> 2Cl- and re: NaBr + e- -> Na+ + Br-. Combining these half-reactions gives the overall balanced equation: 2NaBr + Cl2 -> 2NaCl + Br2. Option B represents these half-reactions correctly.

For the Reaction of Sodium Bromide with Chlorine Gas to Form