Question

Which of the following pairs will give displacement reactions?

• A. $NaCl$ solution and copper metal
• B. $Mg{Cl}_2$ solution and aluminium metal
• C. $FeS{O}_4$ solution and silver metal
• D. $AgN{O}_3$ solution and copper metal.

Answer 1

The correct option is D $AgN{O}_3$ solution and copper metal.

Metal above in activity series are more reactive and can displace the less reactive metal.

(a) $NaCl$ solution and copper metal

$Na$ is more reactive than $Cu$, thus it will not give diplacement reaction.

(b) $MgC{l}_2$ solution and aluminium metal.

$Al$ can not replace $Mg$ because it is lower on the reactivity series.

(c) $FeS{O}_4$ solution and silver metal

$Ag$ can not replace $Fe$ because it is lower on the reactivity series.

(d) $AgN{O}_3$ solution and copper metal.

$Ag$ can be replaced by $Cu$ as it is above silver in the reactivity series. Therefore, this pair will give displacement reaction.

$AgN{O}_3+Cu\to Cu(N{O}_3{)}_2+Ag$

Hence, option $D$ is correct.