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Question

# Which of the following cells give the cells potentials to be their standard values?

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