Question

The $E^{\ominus }forC{u}^{2+}/C{u}^{\oplus },C{u}^{\oplus }/Cu,C{u}^{2+}/Cu,$ are 0.15 V, 0.50 V, and 0.325 V, respectively. The redox cell showing redox reaction $2C{u}^{+},\to C{u}^{2+}+Cu$ is made. $E^{\ominus }$ of this cell reaction and $\Delta G^{\ominus }$ may be :

• A. $E^{\ominus }=0.175Vor{E}^{\ominus }=0.350V$
• B. $n=1$or $2$
• C. $\Delta G^{\ominus }=-33.775kJ$
• D. All of these

Answer 1

Answer: (D)

All of these

$2C{u}^{\oplus }\to C{u}^{2+}+Cu;$
Cell I: $C{u}^{\oplus }\to C{u}^{2+}+e$
$C{u}^{\oplus }+e\to Cu$
$2C{u}^{\oplus }\to C{u}^{2+}+Cu$
$E^{\ominus }=-0.15+0.50$
= + $0.35V$
n = 1
Cell II: $Cu\to C{u}^{2+}+2e$
$2C{u}^{\oplus }+2e\to 2Cu$
$2C{u}^{\oplus }\to C{u}^{2+}+Cu$
$E^{\ominus }=-0.325+0.50$
= + $0.175V$
n = 2