Which one of the following is the correct order of reactivity of Mg, A

Which one of the following is the correct order of reactivity of Mg, Al, Zn and Fe with HCl?

”Mg

”Zn

”Fe

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UPSC CDS-1 – 2024

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The reactivity of metals with dilute acids like HCl to displace hydrogen depends on the position of the metal in the reactivity series. Metals higher in the series are more reactive.

The standard reactivity series (based on standard electrode potentials) places these metals in the order of decreasing reactivity as Mg > Al > Zn > Fe > H. Therefore, their reactivity with HCl follows the same order: Mg > Al > Zn > Fe.

While Aluminium is theoretically more reactive than Zinc, its reaction with acids can sometimes be slower than expected due to the formation of a protective oxide layer on its surface. However, the fundamental order of reactivity based on standard potentials remains Mg > Al > Zn > Fe.

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