9. ⇒ (AIPMT 2011 Prelims )

Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is + 0.15 V and that for the Cr³⁺/Cr couple is $-$ 0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be

(A) + 1.19 V

(B) + 0.89 V

(C) + 0.18 V

(D) + 1.83 V

10. ⇒ (AIPMT 2010 Mains )

Consider the following relations for emf of an electrochemical cell
(i)   EMF of cell = (Oxidation potential of anode) $-$ (Reduction potential of cathode)
(ii)  EMF of cell = (Oxidation potential of anode) + (Reduction potential of cathode)
(iii) EMF of cell = (Reductional potential of anode) + (Reduction potential of cathode)
(iv) EMF of cell = (Oxidation potential of anode) $-$ (Oxidation potential of cathode)

Which of the above relations are correct?

(A) (iii) and (i)

(B) (i) and (ii)

(C) (iii) and (iv)

(D) (ii) and (iv)

11. ⇒ (AIPMT 2008 )

On the basis of the following E^o values, the strongest oxidizing agent is
[Fe(CN)₆]^4$-$ $\to$ [Fe(CN)₆]^3$-$ + e^$-$;  E^o = $-$0.35 V

Fe²⁺ $\to$ Fe³⁺ + e^$-$;  E^o = $-$0.77 V

(A) Fe³⁺

(B) [Fe(CN)₆]^3$-$

(C) [Fe(CN)₆]^4$-$

(D) Fe²⁺

12. ⇒ (AIPMT 2006 )

E^o_Fe²⁺/Fe = $-$ 0.441 V and E^o_{Fe³⁺/Fe²⁺} = 0.771 V, the standard EMF of the reaction Fe + 2Fe³⁺ $\to$ 3Fe²⁺ will be

(A) 0.111 V

(B) 0.330 V

(C) 1.653 V

(D) 1.212 V

13. ⇒ (AIPMT 2006 )

A hypothetical electrochemical cell is shown below.

$A\left|A^{+}\left(xM\right)\right|\left|B^{+}\left(yM\right)\right|B$

The emf measured is + 0.20 V. The cell reaction is

(A) A + B⁺ $\to$ A⁺ + B

(B) A⁺ + B $\to$ A + B⁺

(C) A⁺ + e^$-$ $\to$ A;  B⁺ + e^$-$ $\to$ B

(D) the cell reaction cannot be predicted.

14. ⇒ (AIPMT 2001 )

Standard electrode potentials are
Fe²⁺/Fe [E^o = $-$0.44] and
Fe³⁺/Fe²⁺[ E^o = 0.77];
If Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

(A) Fe³⁺ increases

(B) Fe³⁺ decreases

(C) Fe²⁺/Fe³⁺ remains unchanged

(D) Fe²⁺ decreases.