Which of the following pairs will give displacement reactions?
(i) `NaCl` solution and copper metal
(ii) `MgCl_(2)` solution and aluminium metal
(iii) `FeSO_(4)` solution and silver metal
(iv) `AgNO_(3)` solution and copper metal

Options

A. `NaCl` solution and copper metal
B. `MgCl_(2)` solution and aluminium metal
C. `FeSO_(4)` solution and silver metal
D. `AgNO_(3)` solution and copper metal.

Explanation

To determine which pairs will give displacement reactions, we need to analyze each pair based on the reactivity series of metals. Displacement reactions occur when a more reactive metal displaces a less reactive metal from its compound in solution.

### Step-by-Step Solution:

1. **Understanding Displacement Reactions**:
- Displacement reactions involve a more reactive metal displacing a less reactive metal from its compound.

2. **Referencing the Reactivity Series**:
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