The pair that will give a displacement reaction is D: AgNO3 solution and copper metal.
Explanation:
A displacement reaction occurs when a more reactive metal replaces a less reactive metal in a compound. In this case, copper is more reactive than silver, so when copper metal is added to AgNO3 solution, the copper will displace the silver, forming copper nitrate (Cu(NO3)2) and leaving silver metal behind.
Why the other options are incorrect:
A: NaCl solution and copper metal:
Sodium (Na) is more reactive than copper (Cu), so there would be no displacement reaction.
B: MgCl2 solution and aluminium metal:
Aluminium (Al) is less reactive than magnesium (Mg), so there would be no displacement reaction.
C: FeSO4 solution and silver metal:
Silver (Ag) is less reactive than iron (Fe), so there would be no displacement reaction.