Question

Identify the most reactive and least reactive metal from the following-

$Hg,Na,Fe,Ag$

Answer 1

The reactivity series is a grouping of metals ordered by reactivity from highest to lowest.

Sodium ($Na$) is the most reactive metal of the possibilities since it ranks first in the reactivity series, so it can replace metals that are lower in the series.

Iron ($Fe$) situated in the middle of the reactivity series.

Mercury ($Hg$) and Silver ($Ag$) are towards the bottom of the reactivity series. Silver ($Ag$) is the least reactive metal of the possibilities since it ranks last in the activity series.

Hence, the most reactive meta is Sodium ($Na$) and the least reactive metal is Silver ($Ag$).

The metals can be arranged in the reactivity order as $Sodium\left(Na\right)>Iron\left(Fe\right)>Mercury\left(Hg\right)>Silver\left(Ag\right)$.