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$F e (s) | F e^{2 +} (a q) ∥ B r_{2} (I); B r^{-} (a q) | p t (s)$ তড়িৎ রাসায়নিক কোষের সঠিক কোষ-বিক্রিয়া কোনটি? (Which one is the correct cell reaction of the given electrochemical cell?)

F e + B r_{2} \to F e^{2 +} + 2 B r

F e + 2 B r^{-} \to F e^{2 +} + B r_{2}

F e^{2 +} + B r_{2} \to F e + 2 B r

F e + B r_{2} \to F e^{3 +} + 2 B r

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