Given :
$O_{2} (g) + 4 H^{\oplus} (a q) + 4 e^{-} \to 2 H_{2} O (l)$
$E^{\oplus} = 1.23 V$
$S_{2} O_{8}^{2 -} (a q) + 2 e^{-} \to 2 S O_{2}^{4 -} (a q)$
$E^{⊖} = 2.01 V$
Assertion: Peroxodisulphate salts $(e . g ., N a_{2} S_{2} O_{8})$ are strong oxidizing agents used as bleaching agents for fats, oils, and fabrics.
Reason: Oxygen gas can oxidize sulphate ion to peroxodisulphate ion $(S_{2} O_{8}^{2 -})$ in acidic solution, with the $O_{2} (g)$ being reduced to water.

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

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Assertion is true but Reason is false

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Assertion is false but Reason is true

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Both Assertion and Reason are false

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Solution

The correct option is B Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
Anode : $2 S O_{4}^{2 -} \to S_{2} O_{8}^{2 -} + 2 e^{-}$
$E^{⊖} = 2.01 V$
Cathode : $O_{2} + 4 H^{\oplus} + 4 e^{-} \to 2 H_{2} O$
$E^{⊖} = 1.23 V$
$E_{c e l l}^{⊖} = 1.23 - 2.01 = - 0.78 V < 0$
$\Rightarrow O_{2}$ can oxidize $S O_{4}^{2 -}$ to $S_{2} O_{8}^{2 -}$ .

Suggest Corrections

Similar questions

N a_{2} S_{2} O_{8}

(S_{2} O_{8}^{2 -})

O_{2} (g)

O_{2} (g) + 4 H^{+} (a q) + 4 e \to 2 H_{2} O E^{o} = 1.23 V

S_{2} O_{8}^{2 -} (a q) + 2 e \to 2 S O_{4}^{2 -} (a q) E^{o} = 2.01 V

Peroxodisulphate salts (e.g., $N a_{2} S_{2} O_{8}$ ) are strong oxidizing agents used as
bleaching agents for fats, oils, etc.

Given :

$O_{2} (g) + 4 H^{\oplus} (a q) + 4 e^{-} \to 2 H_{2} O (l)$

$E^{⊖} = 1.23 V$

$S_{2} O_{8}^{2 -} (a q) + 2 e^{-} \to S O_{4}^{2 -} (a q)$

$E^{⊖} = 2.01 V$

C r_{2} O_{3}

Read the assertion and reason carefully to mark the correct option out of the options given below :

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(d) If the assertion and reason both are false.

(e) If assertion is false but reason is true.

Assertion: Acetic acid does not undergo haloform reaction.

Reason: Acetic acid has no alpha hydrogens.

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