The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 x 10-19 C)

1. 6 x 1023

2. 6 x 1020

3. 3.75 x 1020

4. 7.48 x 1023

Subtopic:  Faraday’s Law of Electrolysis |
 77%
From NCERT
NEET - 2016
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Zinc can be coated on iron to produce galvanised iron but the reverse is not possible. It is because

(1) zinc is lighter than iron

(2) zinc has lower melting point than iron

(3) zinc has lower negative electrode potential than iron

(4) zinc has higher negative electrode potential than iron

Subtopic:  Nernst Equation |
 63%
From NCERT
NEET - 2016
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The pressure of H2 required to make the potential of H2-electrode zero in pure water at

298 K is

1. 10-12 atm

2. 10-10 atm

3. 10-4 atm

4. 10-14 atm

 

Subtopic:  Nernst Equation |
 59%
From NCERT
NEET - 2016
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A device that converts energy of the combustion of fuels like hydrogen and methane, directly

into electrical energy is known as:

1. Fuel cell

2. Electrolytic cell

3. Dynamo

4. Ni-Cd cell

Subtopic:  Electrolytic & Electrochemical Cell | Batteries & Salt Bridge |
 83%
From NCERT
NEET - 2015
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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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Links
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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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