JIPMER2011Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which will liberate bromine from a solution of potassium bromide?

Options

AI ₂
BCl ₂
CSO ₂
DHI

Correct answer

B. Cl ₂

Step-by-step solution

Since, E^ of Cl ₂ is higher than that of Br ₂ , therefore Cl ₂ has a higher tendency to accept electrons than Br ₂ . Conversely, Br ⁻ ion has a higher tendency to lose electrons than Cl ⁻ ion. Therefore, the following reaction will occur KBr K ⁺+ Br ⁻2 Br ⁻+ Cl ₂ 2 Cl ⁻+ Br ₂ Thus, Br ⁻ ions are oxidised to Br ₂ by Cl ₂ , which itself is reduced to Cl ⁻ ions.

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