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99 Percentile Qs Bank for JEE MainChemistryRedox Reactions

Which of the following reaction is a redox reaction ?

Options

  1. ANaBr   +   HCl   →   NaCl   +   HBr
  2. BHBr   +   AgNO 3   →   AgBr   +   HNO 3
  3. CH 2   +   Br 2   →   2 HBr
  4. DNa 2 O   +   H 2 SO 4   →   Na 2 SO 4   +   H 2 O

Correct answer

C. H 2   +   Br 2   →   2 HBr

Step-by-step solution

Redox reaction is a reaction in which both oxidation and reduction occurs simentaneously. Oxidation is gain in oxidation number Reduction is loss in oxidation number. 1) Na   + 1 Br - 1   +   H   + 1 Cl - 1   →   Na   + 1 Cl - 1   +   H   + 1 Br - 1 there is no change in the oxidation numbers taking place, so no oxidation and no reduction in this reaction. 2) H   + 1 Br - 1   +   Ag   + 1 N + 5   O - 2 3   →   Ag  

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