The weight of silver (atomic weight = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be : 

1. 5.4 g

2. 10.8 g

3. 54.0 g

4. 108.0 g

Subtopic:  Faraday’s Law of Electrolysis |
 53%
From NCERT
NEET - 2014
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At 25° C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is

9.54 ohm1cm2mol-1 and at infinite dilution its molar conductance is 238 ohm1cm2mol-1.

The degree of ionisation of ammonium hydroxide at the same concentration and

temperature is

1. 2.080%

2. 20.800%

3. 4.008%

4. 40.800%

Subtopic:   Kohlrausch Law & Cell Constant |
 67%
NEET - 2013
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A button cell used in watches functions as following

Zn(s) + Ag2O(s) + H2O (l) 2Ag(s) + Zn2+(aq) + 2OH-(aq)

If half cell potentials are

Zn2+aq +2e-  Znx; Eo = -0.76VAg2Os + H2Ol + 2e-  2Ags + 2OH-aq; Eo = 0.34V

The cell potential will be

1. 0.84 V

2. 1.34 V

3. 1.10 V

4. 0.42 V

 

 

Subtopic:  Electrolytic & Electrochemical Cell |
 81%
From NCERT
NEET - 2013
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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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