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What does the negative sign in the expre...

What does the negative sign in the expression `E_(Zn^(2+)//Zn)^(@)=-0.76V` mean?

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Negative sign for `E_(Zn^(2+)//Zn)^(@)` shows that zinc is more reactive than hydrogen. This means that when zinc electrode is connected to SHE, Znw will be oxidized to `Zn^(2+)` and `H^(+)` will be reduced to `H_(2)`.
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Can a solution of 1 M ZnSO_(4) be stored in a vessel made of copper ? Given that E_(Zn^(+2)//Zn)^(@) =-0.76V and E_(Cu^(+2)//Cu)^(@)=0.34 V

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For the galvanic cell Zn(s)[Zn^2+ (aq)||Ag^+(aq) Ag(s)] , G° of the reaction in joule will be E°_ (Zn^(2+)) /( Zn )= - 0.76V , E°_( Ag_+)/(Ag )= 0.80 V

PRADEEP-ELECTROCHEMISTRY-NCERT EXEMPLAR PROBLEMS WITH ANSWERS, HINTS AND SOLUTIONS (MULTIPLE QUESTIONS-I)
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