In the reaction- I2-2S2O2-3- 2I-S4O2-6-

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Standard XII

Chemistry

Types of Redox Reactions

In the reacti...

Question

In the reaction: $I_{2} + 2 S_{2} O_{3}^{2 -} \to 2 I^{-} + S_{4} O_{6}^{2 -}$ .

I_{2}

is a reducing agent

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I_{2}

is an oxidising agent

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S_{2} O_{3}^{2 -}

is a reducing agent

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S_{2} O_{3}^{2 -}

is an oxidising agent

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Solution

The correct option is B $I_{2}$ is a reducing agent
Oxidation state of $I$ changes from 0 in $I_{2}$ to -1 in $I^{-}$ and oxidation state of $S$ changes from +2 in $S_{2} O_{3}^{2 -}$ to 2.5 in $S_{4} O_{6}^{2 -}$ .So $I_{2}$ acts as oxidising agent and $S_{2} O_{3}^{2 -}$ acts as reducing agent.

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Similar questions

Q. Indicate which of the substance/ion in the following reaction is an oxidising agent and which is a reducing agent?

2 I^{-} + H_{2} O_{2} \to 2 O H^{-} + I_{2}

Q. Three different solutions of oxidising agents, i.e.

K_{2} C r_{2} O_{7}, I_{2}

and

K M n O_{4}

is titrated separately with

0.19

g of

K_{2} S_{2} O_{3}

. The molarity of each oxidising agent is

0.1 M

and the reactions are as follows:
i.

C r_{2} O_{7}^{2 -} + S_{2} O_{3}^{2 -} \to C r^{3 +} + S O_{4}^{2 -}

ii.

I_{2} + S_{2} O_{3}^{2 -} \to I^{⊝} + S_{4} O_{6}^{2 -}

iii.

M n O_{4}^{⊝} + S_{2} O_{3}^{2 -} \to M n O_{2} + S O_{4}^{2 -}

(Molecular weight of

K_{2} S_{2} O_{3} = 190, K_{2} C r_{2} O_{7} = 294, K M n O_{4} = 158,

and

I_{2} = 254 g

m o l^{- 1}

Which of the following statements is/are correct?

Q. Indicate which of the substance/ion in the following reaction is an oxidising agent and which is a reducing agent?

2 C u^{2 +} + 4 I^{-} \to 2 C u I + I_{2}

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)

Q. In the following reaction, the correct statements are:

M g + 2 H^{+} \to M g^{2 +} + H_{2}

M g

is a reducing agent,

H^{+}

is an oxidising agent.
2.

M g

is oxidising agent,

H^{+}

is a reducing agent.

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In the reaction: I2+2S2O2−3→2I−+S4O2−6.

The correct option is B I2 is a reducing agentOxidation state of I changes from 0 in I2 to -1 in I− and oxidation state of S changes from +2 in S2O2−3 to 2.5 in S4O2−6.So I2 acts as oxidising agent and S2O2−3 acts as reducing agent.

In the reaction: $I_{2} + 2 S_{2} O_{3}^{2 -} \to 2 I^{-} + S_{4} O_{6}^{2 -}$ .

The correct option is B $I_{2}$ is a reducing agent
Oxidation state of $I$ changes from 0 in $I_{2}$ to -1 in $I^{-}$ and oxidation state of $S$ changes from +2 in $S_{2} O_{3}^{2 -}$ to 2.5 in $S_{4} O_{6}^{2 -}$ .So $I_{2}$ acts as oxidising agent and $S_{2} O_{3}^{2 -}$ acts as reducing agent.