Select those species that can function both as oxidising and also as reducing agent.

K I

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K I_{3}

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I_{2}

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H_{2} O_{2}

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Solution

The correct options are
B $K I_{3}$
C $I_{2}$
D $H_{2} O_{2}$
Substance can act as both oxidizing as well as a reducing agent when a metal atom is present in its intermediate step.
$K I$ can acts as an only reducing agent as it is present in its lowest oxidation state i.e.,-1.
$K I_{3}$ Iodine is present in -1/3 oxidation state so it can act both oxidizing agent as well as reducing agent.
$I_{2}$ : Iodine is present in 0 oxidation state so it can act as both oxidizing as well as a reducing agent.
$H_{2} O_{2}$ : Oxygen is present in -1 oxidation state so it can act as both oxidizing as well as reducing agent.

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Question 6

Consider the reactions

(i) $H_{2} O_{2} + 2 H I \to I_{2} + 2 H_{2} O$
(ii) $H O C l + H_{2} O_{2} \to H_{3} O^{+} C l^{-} + O_{2}$

Which of the following statements is correct about $H_{2} O_{2}$ with reference to these reactions? Hydrogen peroxide is ........

(a) an oxidising agent in both (i) and (ii)

(b) an oxidising agent in (i) and reducing agent in (ii)

(d) a reducing agent in both (i) and (ii)

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