Limiting molar conductivity of NH4OH (i.e Åm(NH4OH)) is equal to:-

1. Åm (NH4Cl)+Åm(NaCl)-Åm(NaOH) 

2. Åm(NaOH)+Åm(NaCl)-Åm(NH4Cl)

3. Åm(NH4OH)+Åm(NH4Cl)-Åm(HCl)

4. Å(NH4Cl)+Å(NaOH)-Å(NaCl)

Subtopic:   Kohlrausch Law & Cell Constant |
 83%
From NCERT
NEET - 2012
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Kohlrausch's law states that at

(1) finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.

(2) infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of th electrolyte.

(3) infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte.

(4) infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.

Subtopic:   Kohlrausch Law & Cell Constant |
From NCERT
NEET - 2008
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Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -394.4 and -8.2 for H2O(l), CO2(g) and pentane (g), respectively. The value of E°cell for the pentane-oxygen fuel cell is

(1) 1.968 V

(2) 2.0968 V

(3) 1.0968 V

(4) 0.0968 V

Subtopic:  Relation between Emf, G, Kc & pH |
 53%
From NCERT
NEET - 2008
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The equilibrium constant of the reaction:

Cu (s) + 2Ag+ (aq) Cu2+ (aq) + 2Ag(s) ;

Eo = 0.46 V at 298 K is:

1. 2.4 x 1010 2. 2.0 x 1010
3. 4.0 x 1010 4. 4.0 x 1015
Subtopic:  Relation between Emf, G, Kc & pH |
 63%
From NCERT
NEET - 2007
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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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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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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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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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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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