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Electrochemical Series

The standard ...

Question

The standard reduction potential data at $25 º C$ is given below.
$E^{o} (F e^{3 +}, F e^{2 +}) = + 0.77 V;$
$E^{o} (F e^{2 +}, F e) = - 0.44 V$
$E^{o} (C u^{2 +}, C u) = + 0.34 V;$
$E^{o} (C u^{+}, C u) = + 0.52 V$
$E^{o} [O_{2} (g) + 4 H^{+} + 4 e^{-} \to 2 H_{2} O] = + 1.23 V;$
$E^{o} [O_{2} (g) + 2 H_{2} O + 4 e^{-} \to 4 O H^{-}] = + 0.40 V$
$E^{o} (C r^{3 +}, C r) = - 0.74 V;$
$E^{o} (C r^{2 +}, C r) = - 0.91 V$
Match $E^{o}$ of the redox pair in List I with the values given in List II and select the correct answer using the code given below the lists :

List I List-II

P. $E^{o} (F e^{3 +}, F e)$ 1. $- 0.18 V$

Q. $E^{o} (4 H_{2} O \to 4 H^{+} + 4 O H^{-})$ 2. $- 0.4 V$

R. $E^{o} (C u^{2 +} + C u \to 2 C u^{+})$ 3. $- 0.04 V$

S. $E^{o} (C r^{3 +}, C r^{2 +})$ 4. $- 0.83 V$

$P$ $Q$ $R$ $S$

$(A)$ 4 1 2 3

$(B)$ 2 3 4 1

$(C)$ 1 2 3 4

$(D)$ 3 4 1 2

(A)

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(D)

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(B)

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(C)

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Solution

The correct option is B $(D)$

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Q. The standard reduction potential data at

25^{o} C

is given below:

E^{o} (F e^{3 +}, F e^{2 +}) = + 0.77 V

;

E^{o} (F e^{2 +}, F e) = - 0.44 V

E^{o} (C u^{2 +}, C u) = + 0.34 V

E^{o} (C u^{+}, C u) = + 0.52 V

E^{o} [O_{2} (g) + 4 H^{+} + 4 e^{-} \to 2 H_{2} 0] = + 1.23 V

;

E^{o} [O_{2} (g) + 2 H_{2} O + 4 e^{-} \to 40 H^{-}] = + 0.40 V

E^{o} (C r^{3 +}, C r) = - 0.74 V

;

E^{o} (C r^{2 +}, C r) = - 0.91 V

Match

E^{0}

of the redox pair in List 1 with the values given in List 2 and select the correct answer using the code given below the lists.

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.

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

Q. The standard reduction potential data at

25^{o} C

is given below:

E^{o} (F e^{3 +}, F e^{2 +}) = + 0.77 V

;

E^{o} (F e^{2 +}, F e) = - 0.44 V

;

E^{o} (C u^{2 +}, C u) = + 0.34 V

;

E^{o} (C u^{+}, C u) = + 0.52 V

;

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

;

E^{o} (O_{2} (g) + 2 H_{2} O + 4 e^{-} \to 4 O H^{-}) = + 0.4 V

;

E^{o} (C r^{3 +}, C r) = - 0.74 V

;

E^{o} (C r^{2 +}, C r) = - 0.91 V

;
Which of the following statements is/are correct on the basis of above data:

Q. Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list:
List - I List - II
Substances Composition
(A) Plaster of paris (i)

C a S O_{4} \cdot 2 H_{2} O

(B) Epsomite (ii)

C a s O_{4} \cdot \frac{1}{2} H_{2} O

M a S O_{4} \cdot 7 H_{2} O

(D) Gypsum (iv)

M g S O_{4} \cdot H_{2} O

(v)

C a S O_{4}

Q. For the following half cell reactions,

E^{o}

values are also given:

M n^{2 +} + 2 H_{2} O \to M n O_{2} + 4 H^{+} + 2 e^{-}

;

E^{o} = - 1.23 V

M n O_{4}^{-} + 4 H^{+} + 3 e^{-} \to M n O_{2} + 2 H_{2} O

;

E^{o} = + 1.70 V

Select the correct statements.

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	List I		List-II
P.	$E^{o} (F e^{3 +}, F e)$	1.	$- 0.18 V$
Q.	$E^{o} (4 H_{2} O \to 4 H^{+} + 4 O H^{-})$	2.	$- 0.4 V$
R.	$E^{o} (C u^{2 +} + C u \to 2 C u^{+})$	3.	$- 0.04 V$
S.	$E^{o} (C r^{3 +}, C r^{2 +})$	4.	$- 0.83 V$

The correct option is B (D)

The correct option is B $(D)$