Q123 / 200 · MHT CET - Medical 2026 (21 April Shift 1) · Chemistry
Which of the following elements has positive standard reduction potential?
- AAl
- BSn
- Correct answerCCu
- DZn
Solution
The standard reduction potentials of the given elements are:
$E^{\circ}_{\text{Al}^{3+}/\text{Al}} = -1.66 \text{ V}$
$E^{\circ}_{\text{Sn}^{2+}/\text{Sn}} = -0.14 \text{ V}$
$E^{\circ}_{\text{Cu}^{2+}/\text{Cu}} = +0.34 \text{ V}$
$E^{\circ}_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \text{ V}$
Copper (Cu) is the only element among the given options that has a positive standard reduction potential.
Answer: Cu
$E^{\circ}_{\text{Al}^{3+}/\text{Al}} = -1.66 \text{ V}$
$E^{\circ}_{\text{Sn}^{2+}/\text{Sn}} = -0.14 \text{ V}$
$E^{\circ}_{\text{Cu}^{2+}/\text{Cu}} = +0.34 \text{ V}$
$E^{\circ}_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \text{ V}$
Copper (Cu) is the only element among the given options that has a positive standard reduction potential.
Answer: Cu
Hence, the correct answer is option: 'C'.