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Question

Which of the following cells give the cells potentials to be their standard values?
  1. Zn(s)|Zn2+aq(0.01M)||H3O+(aq)(0.01M)|H2(g) (1atm),Pt
     
  2. Cu(s)|Cu2+(aq)(0.25M)||Ag+(aq)(0.5M)|Ag(s)
     
  3. Cd(s)|Cd2+(aq)(0.01M)||pH=1|H2(g)(1 atm), Pt
     
  4. Zn(s)|Zn2+(aq)(0.01M)||pH=1|H2(g) (1 atm),Pt


Solution

The correct options are
A Zn(s)|Zn2+aq(0.01M)||H3O+(aq)(0.01M)|H2(g) (1atm),Pt
 
B Cu(s)|Cu2+(aq)(0.25M)||Ag+(aq)(0.5M)|Ag(s)
 
C Cd(s)|Cd2+(aq)(0.01M)||pH=1|H2(g)(1 atm), Pt
 

(a) Cell reaction :
Zn+(aq)+Zn(s)H2(g)+Zn2+(aq)
Reaction quotient,
Q=PH2×[Zn2+][H+]2=1×0.010.12=1,logQ=0
(b) Cell reaction :
2Ag+(aq)+Cu(s)Cu2+(aq)+2Ag(s)
Q=[Cu2+][Ag+]2=0.25(0.5)2=1,
(c) Cell reaction :
2H+(aq)+Cd(s)H2+Cd2+(aq)Q=PH2×[Cd2+][H+]2=1×0.010.12=1
(d) Cell reaction :
2H+(aq)+Zn(s)H2+Zn2+(aq)
Q=PH2×[Zn2+][H+]2=1×0.010.12=10

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