The standard oxidation potentials of zinc and | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) For a reaction to be spontaneous,the standard cell potential $E^o_{cell}$ must be positive.$E^o_{cell} = E^o_{ox}(	ext{anode}) + E^o_{red}(	ext{

Vedclass · Accepted Answer

$Zn_{(s)} + 2Ag^{+}_{(aq)} 	o Zn^{2+}_{(aq)} + 2Ag_{(s)}$

Vedclass · Answer

(A) For a reaction to be spontaneous,the standard cell potential $E^o_{cell}$ must be positive.$E^o_{cell} = E^o_{ox}(	ext{anode}) + E^o_{red}(	ext{cathode})$Alternatively,$E^o_{cell} = E^o_{ox}(	ext{anode}) - E^o_{ox}(	ext{cathode})$.For the reaction $Zn_{(s)} + 2Ag^{+}_{(aq)} 	o Zn^{2+}_{(aq)} + 2Ag_{(s)}$:$Zn$ is oxidized $(E^o_{ox} = 0.76 \ V)$ and $Ag^+$ is reduced $(E^o_{red} = -E^o_{ox} = 0.80 \ V)$.$E^o_{cell} = 0.76 \ V + 0.80 \ V = 1.56 \ V$.Since $E^o_{cell} > 0$,the reaction is spontaneous. In this reaction,$Zn$ acts as the anode and $Ag$ acts as the cathode.

The standard oxidation potentials of zinc and silver in water at $298 \ K$ are:
$Zn_{(s)} \to Zn^{2+}_{(aq)} + 2e^- ; E^o_{ox} = 0.76 \ V$
$Ag_{(s)} \to Ag^{+}_{(aq)} + e^- ; E^o_{ox} = -0.80 \ V$
Which of the following reactions actually takes place spontaneously?

Similar Questions

What is the observation we get when a gold ring is placed in the solution of $AgNO_3$? $[E_{Ag^{+}|Ag}^o = 0.80 \ V$ and $E_{Au^{3+}|Au}^o = 1.40 \ V]$

Can $E_{cell}^o$ or $\Delta_r G^o$ for a cell reaction ever be equal to zero?

Which metal does not give the following reaction? $M + \text{water} \rightarrow \text{oxide or hydroxide} + H_2$

What is the standard electrode (half-cell) potential? Give its uses.

Give the cell potential formula for the Daniell cell and the Copper-Silver cell.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

The standard oxidation potentials of zinc and silver in water at $298 \ K$ are:$Zn_{(s)} \to Zn^{2+}_{(aq)} + 2e^- ; E^o_{ox} = 0.76 \ V$$Ag_{(s)} \to Ag^{+}_{(aq)} + e^- ; E^o_{ox} = -0.80 \ V$Which of the following reactions actually takes place spontaneously?