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NEET2010Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Bromine is added to cold dilute aqueous solution of NaOH . The mixture is boiled. Which of the following statements is not true?

Options

  1. ADuring the reaction bromine is present in four different oxidation states.
  2. BThe greatest difference between the various oxidation states of bromine is 5 .
  3. COn acidification of the final mixture bromine is formed.
  4. DDisproportionation of bromine occurs during the reaction.

Correct answer

B. The greatest difference between the various oxidation states of bromine is 5 .

Step-by-step solution

aligned & 2 NaOH _ (dilute) + Br ₂ & cold NaBrO + NaBr + H ₂ O & Sodium hypobromide 3 NaBrO 300 ~K 3 NaBrO aligned On acidification, the final mixture gives bromine. aligned & 5 NaBrO + NaBrO ₃+6 HCl & 6 NaCl +3 Br ₂+3 H ₂ O aligned Thus, during the reaction, bromine is present in four different oxidation states i.e., zero in Br ₂,+1 in NaBrO ,-1 in NaBr and +5 in NaBrO ₃ . The greatest difference between various oxidation states of bromine is 6 and not 5 . On acidification of the final mixture, Br ₂ is formed and

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