Which of the following transformations can be carried out by using HI as a reducing agent- under acidic conditions- - Given - I 2 s - 2 I - E -0-54 V -ii Cr-3- rightarrow Cr-2- E - lcirc -0-41 V iii Fe -3- -rightarrow Fe -2- E - circ -0-77 V 1A- i and iiiB- ii and ivC- only iiiD- only ii

The correct option is C only (iii)Here only (iii) E^∘ value is more than 0.54V so HI can be used to reduce Fe^3+ nbsp; nbsp; ...

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Standard X

Chemistry

Electrolysis and Electrolytes

Which of the ...

Question

Which of the following transformations can be carried out by using $H I$ as a reducing agent, under acidic conditions?
$[G i v e n : I_{2} (s) \to 2 I^{-} E^{\circ} = 0.54 V]$
$(i) C u^{+} \to C u E^{\circ} = 0.52 V (i i) C r^{3 +} \to C r^{2 +} E^{\circ} = - 0.41 V (i i i) F e^{3 +} \to F e^{2 +} E^{\circ} = 0.77 V (i v) F e^{2 +} \to F e E^{\circ} = - 0.44 V$

(i) and (iii)

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(ii) and (iv)

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only (iii)

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only (ii)

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Solution

The correct option is C only (iii)
Here only (iii) $E^{\circ}$ value is more than 0.54V so $H I$ can be used to reduce $F e^{3 +}$

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Similar questions

Q. Which of the following transformations can be carried out by using HI as a reducing agent, under acidic conditions?[Given:

I_{2} (s) \to 2 I^{-}

;

E^{⊖} = 0.54 V]

(i)

C u^{+} \to C u (s); E^{⊖} = 0.52 V

(ii)

C r^{3 +} \to C r^{2 +}; E^{⊖} = - 0.41 V

(iii)

F e^{3 +} \to F e^{2 +}; E^{⊖} = 0.77 V

(iv)

F e^{2 +} \to F e (s); E^{⊖} = - 0.44 V

The standard reduction potential data at $25^{\circ} C$ is given below.

$E^{\circ} (F e^{3 +} / F e^{2 +}) = 0.77 V; E^{\circ} (F e^{2 +} / F e) = - 0.44 V; E^{\circ} (C u^{2 +} / C u) = 0.34 V; E^{\circ} (C u^{+} / C u) = + 0.52 V; E^{\circ} (O_{2} (g) + 4 H^{+} + 4 e^{-}) \to 2 H_{2} O = + 1.23 V; E^{\circ} (O_{2} (g) + 2 H_{2} O + 4 e^{-}) \to 4 O H^{-} = + 0.40 V E^{\circ} (C r^{3 +} / C r) = - 0.74 V; E^{\circ} (C r^{2 +} / C r) = + 0.91 V$

Match $E^{\circ}$ of the rebox pair in Column I with the values given in Column II and select the correct answer using the code given below the lists.

$\begin{matrix} C o l u m n I & C o l u m n I I P . E^{\circ} (F e^{3 +} / F e) & 1. - 0.18 V Q . E^{\circ} (4 H_{2} O ⇌ 4 H^{+} + 4 O H^{-}) & 2. - 0.4 V R . E^{\circ} (C u^{2 +} + C u \to 2 C u^{+}) & 3. - 0.04 V S . E^{\circ} (C r^{3 +} / C r^{2 +}) & 4. - 0.83 V \end{matrix}$