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Zn can displace :...

Zn can displace :

A

(a) Mg from its aqueous solution

B

(b) Cu from its aqueous solution

C

(c) Na from its aqueous solution

D

(d) Al from its aqueous solution

Text Solution

AI Generated Solution

The correct Answer is:
To determine which metal ions zinc can displace from their solutions, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Electrochemical Series**: The electrochemical series is a list of metals and their standard reduction potentials (E° values). Metals with higher (more positive) reduction potentials can displace metals with lower (more negative) reduction potentials from their compounds in solution. 2. **Identify Zinc's Position**: Zinc (Zn) has a standard reduction potential of approximately -0.76 V. This means it is more negative compared to some other metals, which indicates that it can displace those metals from their ionic forms in solution. 3. **Compare with Other Metals**: To determine which metals zinc can displace, we need to compare its reduction potential with that of other metals. For example, copper (Cu) has a standard reduction potential of +0.34 V, which is higher than that of zinc. 4. **Displacement Reaction**: Since zinc has a lower reduction potential than copper, it can displace copper from its compounds. For example, when zinc is added to copper(II) sulfate (CuSO₄) solution, a displacement reaction occurs: \[ \text{Zn (s)} + \text{CuSO}_4 (aq) \rightarrow \text{ZnSO}_4 (aq) + \text{Cu (s)} \] In this reaction, zinc displaces copper from the copper sulfate solution, forming zinc sulfate and solid copper. 5. **Conclusion**: Therefore, zinc can displace copper from its aqueous solution. ### Final Answer: Zinc can displace copper from its aqueous solution. ---
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