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STD 12 - 2. Electrochemistry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 2. Electrochemistry4 Marks
MCQ
Given:

$C{o^{3 + }}{e^ - } \longrightarrow C{o^{2 + }};\,{E^o} = 1.81\,V$

$P{b^4} + 2{e^ - } \longrightarrow P{b^{2 + }};\,{E^o} =  + 1.67\,V$

$C{e^{4 + }} + {e^ - } \longrightarrow C{e^{3 + }};\,{E^o} =  + 1.61\,V$

$B{i^{3 + }} + 3{e^ - } \longrightarrow Bi;\,{E^o} =  + 0.20\,V$

Oxidizing power of the species will increase in the order

  • A
    $C{e^{4 + }} < P{b^{4 + }} < B{i^{3 + }} < C{o^{3 + }}$
  • B
    $C{o^{3 + }} < P{b^{4 + }} < C{e^{4 + }} < B{i^{3 + }}$
  • ✓
    $B{i^{3 + }} < C{e^{4 + }} < P{b^{4 + }} < C{o^{3 + }}$
  • D
    $C{o^{3 + }} < C{e^{4 + }} < B{i^{3 + }} < P{b^{4 + }}$
✓

Answer

Correct option: C.
$B{i^{3 + }} < C{e^{4 + }} < P{b^{4 + }} < C{o^{3 + }}$
c
Lower the standard reduction potential, more the ability to get reduced higher the oxidizing power

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Tollen's reagent is used for the detection of aldehyde when a solution of $\mathrm{AgNO}_3$ is added to glucose with $\mathrm{NH}_4 \mathrm{OH}$ then gluconic acid is formed

$ \mathrm{Ag}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag} ; \mathrm{E}_{\text {red }}^{\circ}=0.8 \mathrm{~V} $

$ \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{H}_2 \mathrm{O} \rightarrow \text { Gluconic acid }\left(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_7\right)+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} ; \mathrm{E}_{\text {oxd }}^{\circ}=-0.05 \mathrm{~V} $

$ \mathrm{Ag}\left(\mathrm{NH}_3\right)_2^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}(\mathrm{s})+2 \mathrm{NH}_3 ; \mathrm{E}_{\text {red }}^{\circ}=0.337 \mathrm{~V}$

[Use $2.303 \times \frac{\mathrm{RT}}{\mathrm{F}}=0.0592$ and $\frac{\mathrm{F}}{\mathrm{RT}}=38.92$ at $298 \mathrm{~K}$ ]

$1.$ $2 \mathrm{Ag}^{+}+\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Ag}(\mathrm{s})+\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_7+2 \mathrm{H}^{+}$

Find $\ln \mathrm{K}$ of this reaction.

$(A)$ $66.13$  $(B)$ $58.38$  $(C)$ $28.30$  $(D)$ $46.29$

$2.$ When ammonia is added to the solution, $\mathrm{pH}$ is raised to $11$ . Which half-cell reaction is affected by $\mathrm{pH}$ and by how much?

(A) $E_{\text {oxd }}$ will increase by a factor of $0.65$ from $E_{\text {oxd }}^{\circ}$

(B) $E_{\text {oxd }}$ will decrease by a factor of $0.65$ from $E_{\mathrm{cod}}^{\prime}$

(C) $\mathrm{E}_{\text {red }}$ will increase by a factor of $0.65$ from $\mathrm{E}_{\text {rod }}^{\circ}$

(D) $E_{\text {red }}$ will decrease by a factor of $0.65$ from $E_{\text {rod }}^2$

$3.$   Ammonia is always is added in this reaction. Which of the following must be incorrect?

$(A)$ $\mathrm{NH}_3$ combines with $\mathrm{Ag}^{+}$to form a complex.

$(B)$ $\mathrm{Ag}\left(\mathrm{NH}_3\right)_2^{+}$is a stronger oxidising reagent than $\mathrm{Ag}^{+}$.

$(C)$ In absence of $\mathrm{NH}_3$ silver salt of gluconic acid is formed.

$(D)$ $\mathrm{NH}_3$ has affected the standard reduction potential of glucose/gluconic acid electrode.

Give the answer question $1,2$ and $3.$

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