Electrochemistr...

Only One Option Correct Type

This section contains 17 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q.

Which cell will measure the standard electrode potential of zinc electrode?

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

 emf is given by

For the cell,

Thus (x/y) is

A solution of Fe²⁺  is titrated potentiometrically using Ce⁴⁺ solution.

Fe²⁺ → Fe³⁺ + e^- , E⁰ = -0.77 V

emf of the Pt | Fe²⁺ , Fe³⁺ pair at 50% and 90% titration of Fe²⁺ are   

In the following cell at 298 K,two weak acids (HA) and (HB) with pK_a (HA) = 3 and pK_a (HB) = 5 of equal molarity have been used as shown.

Thus, emf of the cell is   

A concentration cell reversible to anion (Cl^-) is set up

cell reaction is spontaneous ,if 

Which has the maximum potential at 298 K (numerical value) for the half-cell reaction?

2H⁺ + 2e^-  → H₂ (1 bar)   

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...............

Consider the following cell reaction,

2Fe(s) + O₂(g) + 4H⁺ (aq) →2Fe²⁺ (aq) + 2H₂O(l) , E^°= 1.67 V

At [Fe²⁺] = 1 x 10^-3 M.  and pH = 3,the cell potential at 298 K is 

For the following cell with gas electrodes at p₁ and p₂ as shown:

Cell reaction is spontaneous , if  

For the half-cell, Cl^-|Hg₂Cl₂, Hg(l), E = 0.280V at 298K electrode potential has maximum value when KCl used is 

Given at 298 K standard oxidation potential of quinhydrone electrode = -0.699 V Standard oxidation potential of calomel electrode = -0.268 V

Thus, emf of the cell at 298 K is 

E^°_red (standard reduction electrode potentials) of different half-cell are given

In which cell , is ΔG^° most negative?

Given the following half-cell reactions and corresponding reduction potentials: 

Which combination of two half-cell would result in a cell with largest (E^°_cell > 0)?   

For

Then E^° for the reaction    

Following half-cell, Pt (H₂)|H₂O behaves as SHE at a pressure of

Electrode potential of the following half-cell is dependent on
Hg, HgO |OH^-(aq)