Which one of the following is the correct reactivity order of metals r

Which one of the following is the correct reactivity order of metals reacting with dilute HCl?

”Mg

”Fe

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UPSC CDS-2 – 2021

The reactivity of metals with dilute acids like HCl generally decreases down the reactivity series. Metals above hydrogen in the reactivity series can displace hydrogen from dilute acids. The correct order of reactivity for the given metals is Mg > Al > Zn > Fe. Magnesium is the most reactive among these, followed by Aluminum, then Zinc, and finally Iron.

The reactivity series of metals is determined by their tendency to lose electrons and form positive ions. Metals higher in the series are more reactive and can displace less reactive metals (or hydrogen from acids) from their compounds. The order of reactivity of these common metals is Mg > Al > Zn > Fe.

While this is the general order, the rate of reaction can sometimes be affected by factors like surface passivation (e.g., Aluminum forming a protective oxide layer), but the inherent reactivity order based on standard electrode potentials is Mg > Al > Zn > Fe.

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