Select the appropriately balanced redox equation that would provide the greatest

Question

Select the appropriately balanced redox equation that would provide the greatest, positive value of E^O_Cell from cell reactions listed below 3Fe(s) + 2Al^3+(aq) rightarrow 2Al(s) + 3Fe^2+(aq) 2Al(s) + 3Cu^2+ (aq) rightarrow 3Cu(s) + 2Al^3+(aq) 2Al(s) + 3Fe^2+(aq) rightarrow 3Fe(s) + 2Al^3+(aq) Fe(s) + Cu^2+(aq) rightarrow Fe^2+ (aq) + Cu(s) 3Cu(s) + 2Al^3+(aq) rightarrow 2Al(s) + 3Cu^2+(aq) Which of the following species would be appropriate for use in the salt bridge for the redox reaction below, under standard conditions? The salt should not interfere with the reaction. Fe(s) + Cu^2+(aq) rightarrow Fe^2+(aq) + Cu(s) HC_2H_3O_2 HCl NaNO_3 NaOH CuS Consider an electrochemical cell created by connecting one half-cell with Mg(s) and Mg^2+(aq) (1.0 M) and another half-cell with Fe^3+(aq) (1.0 M) and Fe(s) at 25 degree C, which of the following best describes the characteristics of the cell? A reaction A rightarrow B has an equilibrium constant of 2.0 and a Delta G_0_rxn of-1.7 kJ. For each of the following conditions (which may or may not be at equilibrium), indicate whether Delta G_rxn (not Delta G^0_rxn) is positive, negative, or 0. [A] = 1.0 M, [B] = 1.0 M [A] = 2.0 M, [B] = 1.0 M [A] = 1.0 M, [B] = 2.0 M What is the sign of Delta S_rxn for each of the following reactions. No calculations are necessary. 2NaN_3(s) rightarrow 2Na(s) + 3N_2(g) HCl(g) + NH_3(g) rightarrow NH_4Cl(s) N_2(g) + 3H_2(g) rightarrow 2NH_3(g)

Explanation / Answer

Q12)

The SRP values of Al, Fe and Cu are in the order Cu> Fe> Al . Thus the reaction which gives maximum potential is

2Al + 3 CU+2 ---> 3Cu + 2Al+3

Option B is correct

Q13) Option C

The purpose of salt bridge is to supply positive and negative ions to the respective half cells , so that electrical neutrality is balanced and also to complete the circuit.

Thus the ions of the lecrolyte taken in salt bridge should havesame ionic mobility. which is the case with NaNO3.

Similarly NH4Cl also can be used in salt bridge.

Q14) optio A As the SRP of Mg is -2.37 and Fe is -0.04, Al undergoes oxidation and Fe+3 undergoes reduction readily. Thus the emf of cell = +2.37-0.04 = 2.33 V

Q10) Delta G = delta Go + 2.303 RT log [products]/[reactants]

case 1 delta G = -1.7x1000 J + 2.303x 8.314x 298 xlog 1.0/1.0

= -1.7kJ

case 2 delta g = -1700 j +  2.303x 8.314x 298 xlog 1.0/2.0

= -1700 J -1717J

= -3417J

case 3 Delta G = -1700 J +  2.303x 8.314x 298 xlog 2.0/1.0

= 1700 +1717

= +17J

Thus option C is correct.

Q11) Option C is correct.

Check the difference innumber of gaseous products and reactants.

reaction 1 delta n(g) = 3-0 =3, delta s is ppositive

reaction 2 delta n(g) = 0-2= -2,delta s is negative

reaction 2 delta n(g) = 2-4 =-2, delta s is negative

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