The standard reduction potential of Z n and Ag in water at 298 K are, Zn 2++2 e- arrow Zn ; E°=-0.76 V and Ag ++e- arrow Ag ; E°=+0.80 V Which of the following reactions takes place?

Question

The standard reduction potential of Z n and Ag in water at 298 K are, Zn 2++2 e- arrow Zn ; E°=-0.76 V and Ag ++e- arrow Ag ; E°=+0.80 V Which of the following reactions takes place? (A) Zn 2+ (a q)+ Ag + (a q) arrow Zn (a q)+ Ag (s) (B) Zn (s)+ Ag (a q) arrow Zn 2+ (a q)+ Ag + (a q) (C) Zn 2+ (a q)+2 Ag (s) arrow 2 Ag + (a q)+ Zn (s) (D) Zn (s)+2 Ag +(a q) arrow Zn 2+ (a q)+2 Ag (s)

Tardigrade Admin · Accepted Answer

The values of standard reduction potential of

Z n

and

A g

suggest that

Z n

would undergo oxidation (lower reduction potential) and

A g

would undergo reduction (higher reduction potential). So the cell reaction must be

Z n + 2 A g^{+} \to Z n^{2 +} + 2 A g

Q. The standard reduction potential of $Z n$ and $A g$ in water at $298 K$ are,
$Z n^{2 +} + 2 e^{-} \to Z n; E^{\circ} = - 0.76 V$ and
$A g^{+} + e^{-} \to A g; E^{\circ} = + 0.80 V$
Which of the following reactions takes place?

$Z n^{2 +}_{(a q)} + A g^{+}_{(a q)} \to Z n_{(a q)} + A g_{(s)}$

$Z n_{(s)} + A g_{(a q)} \to Z n^{2 +}_{(a q)} + A g^{+}_{(a q)}$

$Z n^{2 +}_{(a q)} + 2 A g_{(s)} \to 2 A g^{+}_{(a q)} + Z n_{(s)}$

$Z n_{(s)} + 2 A g_{(a q)}^{+} \to Z n^{2 +}_{(a q)} + 2 A g_{(s)}$

The values of standard reduction potential of $Z n$ and $A g$ suggest that $Z n$ would undergo oxidation (lower reduction potential) and $A g$ would undergo reduction (higher reduction potential). So the cell reaction must be

$Z n + 2 A g^{+} \to Z n^{2 +} + 2 A g$

Q. The standard reduction potential of Zn and Ag in water at 298K are, Zn2++2e−→Zn;E∘=−0.76V and Ag++e−→Ag;E∘=+0.80V Which of the following reactions takes place?

Zn2+(aq)​+Ag+(aq)​→Zn(aq)​+Ag(s)​

Zn(s)​+Ag(aq)​→Zn2+(aq)​+Ag+(aq)​

Zn2+(aq)​+2Ag(s)​→2Ag+(aq)​+Zn(s)​

Zn(s)​+2Ag(aq)+​→Zn2+(aq)​+2Ag(s)​