Question

Given:
$Pb+Cu(N{O}_3{)}_2\to Pb(N{O}_3{)}_2+Cu$
$Cu+Ag(N{O}_3{)}_2\to Cu(N{O}_3{)}_2+Ag$
$Zn+Pb(N{O}_3{)}_2\to Zn(N{O}_3{)}_2+Pb$
The least reactive metal is,

• A. $Pb$
• B. $Ag$
• C. $Cu$
• D. $Zn$

Answer 1

The correct option is B $Ag$

The least reactive metal is that which can easily be displaced from its salt solution by any other given metals.
From reaction $1:Pb$ is more reactive than $Cu$
From reaction $2:Cu$ is more reactive than $Ag$
From reaction $3:Zn$ is more reactive than $Pb$
The least reactive metal from $1,2$ and $3$ is $Ag$.