Electrochemistr...

Only One Option Correct Type

This section contains 15 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct

Q.

Temperature coefficient of EMF of a cell in terms of entropy change is

The standard reduction potential at 298 K of the reaction, 

2H₂O + 2e^-  H₂ + 2OH^-  is 0.8277 V

Thus,thermodynamic equilibrium constant for the reaction. 

2H₂O  H₃O⁺ + OH^- at 298 K is  

Given ,  

Thus ,equilibrium constant for the reaction in terms of log k is

2Fe³⁺ + 3I^-  2Fe²⁺ + I^-₃   

Given ,

Thus ,(log K_eq) for the reaction   Cu²⁺ +In²⁺  Cu⁺ + In³⁺ is   

An excess of liquid mercury is added to an acidified solution of 1.0 x 10^-3 M Fe³⁺ .Thus  is if 5% of Fe³⁺ remains at equilibrium at 298 K

EMF of the following cell is 0.2905 V

Zn/Zn²⁺ (a = 0.1M)|| Fe²⁺ (a = 0.01M)| Fe

 The equilibrium constant for the cell reaction is   

[IIT JEE 2004]

The half-cell reactions for rusting of iron are

ΔG^° (in kJ) for the reaction is     

[IIT JEE 2005]

The Gibbs free energy for the decomposition of Al₂O₃ at 800 K is as follows :

2Al₂O₃ → 4Al + 3O₂ , Δ_rG = 2898kJ mol^-1

The potential difference needed for electrolytic reduction of Al₂O₃ is at least  

Given ,  

The value of standard electrode potential for the half-reaction is

Fe³⁺(aq) + e^- → Fe²⁺(aq) 

For the reaction, 2H₂(g) + O₂(g) → 2H₂O(l), E⁰_cell = 1.23 V at 298 K 

and  ΔH⁰_f (H₂O) = - 285.8 kJ mol^-1 Thus, ΔS^° (standard entropy change ) is  

For the reaction ,

Thus , for the reaction 

Consider the following equations for a cell reaction. 

A+B  C+ D, E⁰ = x volt, K_eq = K₁

2A +2B  2C+ 2D, E⁰ = y volt, K_eq = K₂

Then,   

Which of the following statements about the spontaneous reaction occurring in a galvanic cell is always true?

For a (Ag-Zn) button cell ,the net reaction is 

Zn(s) + Ag₂O(s) → ZnO(s) + 2Ag(s)

ΔG⁰_f(Ag₂O) = -11.21kJmol^-1,  ΔG⁰ _f(ZnO) = - 318.3 kJ mol^-1

Hence, E^°_cell of the button cell is  

For the reaction ,

Thus  

Matching List Type

Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct

Q.

The standard reduction potential data at 298 K is given below:

Match E^° of a redox pair in Column I with the values given in Column II and select the corect answer using the codes given below:

The standard potential of the following cell is 0.23 V at 288 K and 0.21 V at 308 K. 

Match the parameters in Column I with their values in Column II and select the answer from the codes given below the list.