All questions of Electrochemistry for NEET Exam

• a)
  326.6 S cm² mol^-1
• b)
  38.6 S cm² mol^-1
• c)
  181.6 S cm² mol^-1
• d)
  90.8 S cm² mol^-1

• a)
  A will be a good oxidising agent
• b)
  A will accept electrons easily
• c)
  A will undergo reduction easily
• d)
  A will undergo oxidation easily

• a)
  A is easily reduced
• b)
  A ^– is easily reduced
• c)
  A ^– is easily oxidised
• d)
  A is easily oxidised

• a)
  Mg
• b)
  Sn
• c)
  Ag
• d)
  Zn

• A:

  temperature only

• B:

  Concentration of electrolyte only

• C:

  Both a and b

• D:

  Density of the electrodes

The answer is c.

• a)
  298K
• b)
  300K
• c)
  30?C​
• d)
  310K

• a)
  E^θRed is positive
• b)
  ΔG^θ is positive
• c)
  ΔG^θ is negative
• d)
  E^θRed is negative.

Calculate the standard cell potentials of galvanic cell, ∆_rG and equilibrium constant of the reactions if the reaction is

• a)
  0.01V, – 2.800 kJ mol^–1, 3.2
• b)
  0.03V, – 2.895 kJ mol^–1, 3.2
• c)
  0.02V, – 2.850 kJ mol^–1, 3.2
• d)
  0.04V, – 2.955 kJ mol^–1, 3.2

• a)
  I
• b)
  !!
• c)
  ((
• d)
  II

• a)
  Velocity of K⁺ and NO₃^– are same
• b)
  Velocity of NO₃^– is greater than that of K⁺
• c)
  Velocity of K⁺ is greater than that of NO₃^–
• d)
  KNO₃ is highly soluble in water

• a)
  6 FE°cell
• b)
  3 FE°cell
• c)
  -2 FE°cell
• d)
  -6 FE°cell

• a)
  (molar conductance at infinite dilution) of strong electrolytes as well as weak electrolytes can be obtained by Kohlrausch’s law.
• b)
   of strong as well as weak electrolytes can be obtained by extrapolation of graph between 
• c)
  can be obtained by known value of 
• d)
  

Comprehension Type

Direction : This section contains 2 paragraphs, each describing theory, experiments, data, etc. Four questions related to the paragraphs have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage I

Consider the following solutions of an electrolyte 

Q. 

Conductivity.of 0.2 M solution is

• a)
  2.60 Sm^-1 
• b)
  0.25 Sm^-1 
• c)
  4.00 Sm^-1 
• d)
  0.50 Sm^-1 

• a)
  Zn²⁺ ions are oxidized to Zn
• b)
  Zn is oxidized to Zn²⁺ ions
• c)
  Zn is reduced to Zn²⁺ ions
• d)
  Cu²⁺ ions are oxidized to Cu

   

  •  

• a)
  A will be a good oxidising agent
• b)
  A will accept electrons easily
• c)
  A will undergo reduction easily
• d)
  A will undergo oxidation easily

• a)
  A will lose electrons easily
• b)
  A will undergo reduction easily
• c)
  A will undergo oxidation easily
• d)
  A will be a good reducing agent

• a)
  Cathode to anode in outer circuit
• b)
  Anode to cathode outside the cell
• c)
  Cathode to anode inside the cell 
• d)
  Anode to cathode inside the cell

• a)
  6250 S m² mol^-1
• b)
  6.25 x 10^-4 S m² mol^-1
• c)
  62.5 x 10^-4 S m² mol^-1
• d)
  62.5 S m² mol^-1

• a)
  Reactivity
• b)
  Ionic behaviour
• c)
  Oxidation potential
• d)
  Reduction potential

• a)
  73.0%
• b)
  37.0%
• c)
  63.0%
• d)
  137.0%

• a)
  0.01M NaCl 
• b)
  0.050 M NaCl
• c)
  0.005M NaCl
• d)
  0.02M NaCl

EMF of the following cell is 0.2905 V

 

The equilibrium constant for the cell reaction is   

[IIT JEE 2004]

• a)
  10^0.32/0.059
• b)
  10^0.32/0.0295
• c)
  10^0.26/0.0295
• d)
  10^0.32/0.295

On the basis of the following E° values, the strongest oxidizing agent is: 

• a)
  [Fe(CN)₆]^4-
• b)
  Fe²⁺
• c)
  Fe³⁺
• d)
  [Fe(CN)₆]^3-

For the cell,  and for the cell Pt(H₂) | H⁺ (1M)| Ag,  

Thus E_cell for the

Ag|Ag⁺ (0.1M) || Zn²⁺ (0.1M) | Zn is  ....................and cell reaction is...............

• a)
  1.44 V ,spontaneous
• b)
  0.4 V ,spontaneous
• c)
  -1.44 V ,non-spontaneous
• d)
  -1.53 V ,non-spontaneous

• a)
  at infinite dilution the ionic conductivity of ions is additive.
• b)
  at infinite dilution the ionic conductivity of all the ions of the electrolyte become equal.
• c)
  at infinite dilution the concentration of the electrolyte becomes unity.
• d)
  at infinite dilution the concentration of ions increases.

• a)
  Boltzmann constant
• b)
  Faraday’s constant
• c)
  Gas constant
• d)
  Universal gas constant

• a)
  tendency of a cell reaction to occur
• b)
  current carried by an elelctrode
• c)
  tendency of the electrode to gain or lose electrons
• d)
  difference in the ionisation of electrode and metal ion

• a)
  Mg, Al, Zn, Fe, Cu
• b)
  Mg, Al, Zn, Cu, Fe
• c)
  Mg, Al, Cu, Fe, Zn
• d)
  Cu, Al, Zn, Fe, Mg

• a)
  Increase [Cd²⁺] as well as [Cu²⁺] to 2.0 M
• b)
  Increase only [Cu²⁺] to 2.0 M
• c)
  Reduce only [Cd²⁺] to 0.1 M
• d)
  Decreases [Cd²⁺] to 0.1M and increases [Cu²⁺] to 1.0M

• a)
  -89.0 kJ  
• b)
  -44.5 kJ
• c)
  -98.0 kJ
• d)
  -89.0 J

• a)
  Salt bridge
• b)
  Electrolyte
• c)
  Anode
• d)
  Cathode

• a)
  Hydrolysis
• b)
  Reduction
• c)
  Oxidation
• d)
  Neutralization

• a)
  cell will discharge easily
• b)
  Cell reaction is spontaneous
• c)
  Cell reaction is non spontaneous
• d)
  Cell will work under standard conditions

• a)
   A
• b)
   A
• c)
  A
• d)
   A

• a)
  by covering the surface with oil
• b)
  by covering the surface with salt
• c)
  by covering the surface with citric acid
• d)
  by covering the surface with paint or by some chemicals

• a)
  A>B>C
• b)
  Cannot be answered
• c)
  B>C>A
• d)
  A

• a)
  Gm ampere^-1
• b)
  Gm/coulomb
• c)
  Gm-ampere
• d)
  Coulomb/gram

• a)
  Reduction
• b)
  Neutralization
• c)
  Hydrolysis
• d)
  Oxidation

• a)
  0.219 cm^-1
• b)
  0.239 cm^-1
• c)
  0.229 cm^-1
• d)
  0.209 cm^-1

• a)
  Galvanometer
• b)
  Voltmeter
• c)
  Electrometer
• d)
  Pyrometer

For the following cell with hydrogen electrodes at two different  pressure p₁ and p₂ 

 emf is given by

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  Cell potential’ E _cell‘ becomes zero
• b)
  Equilibrium constant becomes equal to electrode potential
• c)
  Equilibrium constant becomes zero
• d)
  Cell potential ‘E _cell‘ becomes unity

• a)
  9 h
• b)
  4.5 h
• c)
  1 h
• d)
  3.0 h

• a)
  1 : 1 : 1
• b)
  6 : 3 : 2
• c)
  6 : 3 : 1
• d)
  1 : 3 : 6

• a)
  0.77 V , 0.826 V
• b)
  -0.826 V , -0.77 V
• c)
  -0.77 V ,-0.826 V
• d)
  0.00 V , 0.00 V

• a)
  Zn|zn²⁺||Cu²⁺|Cu
• b)
  Cu²⁺|Cu||Zn|zn²⁺
• c)
  Zn|zn²⁺||Cu|Cu²⁺
• d)
  Cu|Cu²⁺||zn²⁺|Zn

• a)
  0.2182 cm^-1
• b)
  0.2281 cm^-1
• c)
  0.2821 cm^-1 
• d)
  0.2381 cm^-1

• a)
  4.84F
• b)
  4.44F
• c)
  4.54F
• d)
  4.64F

• a)
  9650C
• b)
  96500C
• c)
  965C
• d)
  96.5C