The efficiency of a fuel cell is given by:

(a) H/G                      (b) G/S
(c) G/H                      (d) S/G

Subtopic:  Hydrogen Economy |
 66%
NEET - 2007
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Hints

A hypothetical electrochemical cell is shown below A l A+ (xM)l l B+ (yM) l B
The Emf measured is +0.20 V.The cell reaction is:-
(1) A+ B → A + B+

(2) A+ e→  A ; B+ e→ B

(3) the cell reaction cannot be predicted

(4) A + B→ A+ B

Subtopic:  Nernst Equation |
 70%
From NCERT
NEET - 2006
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NEET 2023 - Target Batch - Aryan Raj Singh

The E° in the given diagram is,

(1) 0.5

(2) 0.6

(3) 0.7

(4) 0.8

Subtopic:  Relation between Emf, G, Kc & pH |
 62%
From NCERT
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Hints

At 298K the standard free energy of formation of H2O(l) is –237.20kJ/mole while that of its ionisation into H+ iion and hydroxyl ions is 80 kJ/mole, then the emf of the following cell at 298 K will be

H2(g,1 bar) | H+ (1M) || OH(1M) | O2 (g, 1bar)

(1) 0.40 V

(2) 0.81 V

(3) 1.23 V

(4) –0.40 V

Subtopic:  Relation between Emf, G, Kc & pH |
From NCERT
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Which of the following cell can produce more electric work.

(1) pt,H2|NH4Cl||0.1MCH3COOH|H2,pt

(2) pt,H2|0.1MHCl||0.1MNaOH|H2,pt

(3) pt,H2|0.1MHCl||0.1MCH3COOK|H2,pt

(4) pt,H2|0.1MCH3COOK||0.1MHCl|H2,pt

 

Subtopic:  Relation between Emf, G, Kc & pH |
From NCERT
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Hints

At what [Br-][CO32] does the following cell have its reaction at equilibrium?

Ag(s) | Ag2CO3(s) | Na2CO3 (aq) || KBr(aq) | AgBr(s) | Ag(s)

KSP = 8 × 10–12 for Ag2CO3 and KSP = 4 × 10–13 for AgBr

(1) 1 × 10–7

(2) 2 × 10–7

(3) 3 × 10–7

(4) 4 × 10–7

Subtopic:  Relation between Emf, G, Kc & pH |
 73%
From NCERT
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Hints

It is observed that the voltage of a galvanic cell using the reaction M(s) + xH+ Mx+ + x2 H2 varies linearly with the log of the square root of the hydrogen pressure and the cube root of the Mx+ concentration. The value of x is:

1. 2

2. 3

3. 4

4. 5

Subtopic:  Nernst Equation |
 62%
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Hints

Acetic acid has Ka = 1.8 × 10–5 while formic acid had Ka = 2.1 × 10–4. What would be the magnitude of the emf of the cell

Pt(H2) 0.1M acetic acid+0.1M sodium acetate0.1M formic acid+0.1M sodium formate Pt(H2) at 25°C

(1) 0.0315 volt

(2) 0.0629 volt

(3) 0.0455 volt

(4) 0.0545 volt

Subtopic:  Nernst Equation |
 68%
From NCERT
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Hints

Consider the cell Ag(s)|AgBr(s)|Br–(aq)||AgCl(s)|Cl–(aq)|Ag(s) at 25°C. The solubility product constants of AgBr & AgCl are respectively 5 × 10–13 & 1 × 10–10. For what ratio of the concentrations of Br& Clions would the emf of the cell be zero ?

(1) 1 : 200

(2) 1 : 100

(3) 1 : 500

(4) 200 : 1

Subtopic:  Nernst Equation |
From NCERT
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Hints

Calculate the useful work of the reaction Ag(s) + 1/2Cl2(g) AgCl(s)

Given E°Cl2/Cl = + 1.36 V, E°AgCl/Ag,Cl = 0.22 V

If PCl2 = 1 atmand T = 298 K

(1) 110 kJ/mol

(2) 220 kJ/mol

(3) 55kJ/mol

(4) 1000 kJ/mol

Subtopic:  Relation between Emf, G, Kc & pH |
 65%
From NCERT
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Hints
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NEET 2023 - Target Batch - Aryan Raj Singh