When reacting with steam, which of the following metals shows the fastest rate of reaction?

Aluminium

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Zinc

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Iron

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Magnesium

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Solution

The correct option is D
Magnesium

From the reactivity series, the order of reactivity is Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe). So, magnesium is the most reactive among the given metals and thus it's rate of reaction will be fastest (to react with steam). Metals like Potassium (K), Sodium (Na) and Calcium (Ca) are metals of high reactivity so they react even with cold water but magnesium does not. Even with hot water, magnesium is slow to react but with steam, magnesium exhibits a vigorous reaction.

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