Question

The standard electrode potential of Zn, Ag and Cu are \(-0.76\), \(0.80\) and \(0.34\) volt respectively, then identify the correct statement from following.

• A. Ag can oxidise Zn and Cu
• B. Ag can reduce \(\text{Zn}^{2+}\) and \(\text{Cu}^{2+}\)
• C. Zn can reduce \(\text{Ag}^{+}\) and \(\text{Cu}^{2+}\)
• D. Cu can oxidise Zn and Ag

Hint:

The metal with the lowest reduction potential is the strongest reducing agent and can reduce the ions of metals with higher potentials.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
A lower standard reduction potential means a stronger reducing agent. A higher value means the ion is a stronger oxidising agent.

Step 2: Order the metals
Reduction potentials: Zn \((-0.76)\) < Cu \((0.34)\) < Ag \((0.80)\) volt.

Step 3: Conclusion
Zn can give electrons to both \(\text{Cu}^{2+}\) and \(\text{Ag}^{+}\). For \(\text{Zn}+\text{Cu}^{2+}\), \(E^{0}=0.34-(-0.76)=+1.10\) V, which is positive, so the reaction occurs.

Final Answer:
Zn can reduce \(\text{Ag}^{+}\) and \(\text{Cu}^{2+}\). \[ \boxed{\text{(C) }\text{Zn can reduce Ag}^{+}\text{ and Cu}^{2+}} \]