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Question
Consider the reactions
(A) \[\ce{H2O2 + 2HI -> I2 + 2H2O}\]
(B) \[\ce{HOCl + H2O2 -> H3O+ + Cl- + O2}\]
Which of the following statements is correct about \[\ce{H2O2}\] with reference to these reactions? Hydrogen perioxide is ______.
Options
an oxidising agent in both (A) and (B).
an oxidising agent in (A) and reducing agent in (B).
a reducing agent in (A) and oxidising agent in (B).
a reducing agent in both (A) and (B).
Solution
Which of the following statements is correct about \[\ce{H2O2}\] with reference to these reactions? Hydrogen perioxide is an oxidising agent in (A) and reducing agent in (B).
Explanation:
(b) \[\ce{\overset{+1}{H2}\overset{-1}{O2} + 2\overset{+1}{H}\overset{-1}{I} -> \overset{0}{I}2 + 2\overset{+1}{H2}\overset{-2}{O}}\]
O.N. of oxygen is decreased from –1 \[\ce{(H2O2)}\] to –2 \[\ce{(H2O)}\], therefore, it is reduced and acts as an oxidizing agent.
\[\ce{HOCl + H2\overset{-1}{O2} -> H3O^{+} + Cl^{-} + \overset{0}{O2}}\]
O.N. of oxygen is increased from –1 \[\ce{(H2O2)}\] to 0 \[\ce{(O2)}\], therefore, it is oxidized and acts as a reducing agent.
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