Which one of the following is the correct order of reactivity of Mg, Al, Zn and Fe with HCI?
Mg > Al > Zn > Fe
This question asks us to determine the correct order of reactivity for Magnesium (Mg), Aluminum (Al), Zinc (Zn), and Iron (Fe) when they react with Hydrochloric Acid (HCl).
The reactivity of metals refers to how readily they undergo a chemical reaction. When metals react with acids like HCl, they typically displace hydrogen from the acid, forming a metal salt and releasing hydrogen gas (\(H_2\)). The speed at which this reaction occurs indicates the metal's reactivity. More reactive metals react faster.
The general reaction is:
Metal + Hydrochloric Acid \(\rightarrow\) Metal Chloride + Hydrogen Gas
Scientists arrange metals in a list called the reactivity series (or electrochemical series) based on their tendency to lose electrons and react. Metals higher up in this series are more reactive than those lower down.
The typical order of reactivity for the metals mentioned, starting from the most reactive, is:
So, the general reactivity order is Mg > Al > Zn > Fe.
Let's look at how each metal behaves with HCl:
Here's a summary of the relative reactivity with HCl:
| Metal | Reactivity with HCl (Decreasing Order) |
|---|---|
| Magnesium (Mg) | Most Reactive |
| Aluminum (Al) | Reactive (initial layer may slow reaction) |
| Zinc (Zn) | Moderately Reactive |
| Iron (Fe) | Least Reactive (among these four) |
Based on the reactivity series and their behavior with HCl, the correct order of reactivity from most reactive to least reactive is Magnesium > Aluminum > Zinc > Iron.
Therefore, the correct option is Mg > Al > Zn > Fe.
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