Consider the reactions

(A) H_{2}O_{2}+2HI\rightarrow I_{2}+2H_{2}O            (B) HOCl+H_{2}O_{2}\rightarrow H_{3}O^{+}+Cl^{-}+O_{2}

Which of the following statements is correct about H_{2}O_{2}  with reference to these reactions? Hydrogen peroxide is ________.
(i) an oxidising agent in both (A) and (B)
(ii) an oxidising agent in (A) and reducing agent in (B)
(iii) a reducing agent in (A) and oxidising agent in (B)
(iv) a reducing agent in both (A) and (B)

Answers (1)

The answer is the option (ii) an oxidizing agent in (A) and reducing agent in (B)

  1. H_{2}O_{2}+2HI\rightarrow I_{2}+2H_{2}O
  2. HOCl+H_{2}O_{2}\rightarrow H_{3}O^{+}+Cl^{-}+O_{2}

Hydrogen peroxide in (A) is an oxidising agent as the oxygen in equation (a) gets reduced from H_{2}O_{2} \;to\; H_{2}O

 

H_{2}O_{2}+2HI\rightarrow I_{2}+2H_{2}O

+1 -1            +1  -1     0         +1 -2

Hydrogen peroxide in (B) is a reducing agent as oxygen increases from H_{2}O_{2} \;to\;O_{2}

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