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Which of the following metals reacts only with steam NOT with cold or hot water?
Aluminium
Magnesium
Potassium
Sodium
Aluminium
Magnesium is a moderately reactive metal that does not react with cold or hot water. It reacts exclusively with steam to produce magnesium oxide and hydrogen gas.
Magnesium is a moderately reactive metal that does not react with cold or hot water. It reacts exclusively with steam to produce magnesium oxide and hydrogen gas.
Think of it like cooking: some ingredients (highly reactive metals) cook instantly at room temperature, while tougher ingredients (like magnesium) need the intense heat of a pressure cooker (steam) to soften up and react.
Remember the 'Reactivity Series' order: Potassium > Sodium > Magnesium > Aluminium > Zinc > Iron.
Mg+H2тАЛOтЖТMgO+H2тАЛ тАФ Reaction of Magnesium with Steam
The reactivity of metals with water follows a trend. While highly reactive metals like potassium and sodium react vigorously with cold water, metals like magnesium are less reactive and require the higher thermal energy provided by steam to overcome the activation energy barrier for the displacement reaction. The chemical reaction is: Mg(s)тАЛ+H2тАЛO(g)тАЛтЖТMgO(s)тАЛ+H2тАЛ(g)
Potassium and Sodium are highly reactive and react with cold water.
Magnesium reacts slowly with hot water but readily with steam.
Aluminium, Zinc, and Iron react only with steam.
The displacement reaction produces hydrogen gas which can be tested by the 'pop' sound.
Used in the preparation of hydrogen gas in laboratory setups.
Industrial production of magnesium oxide.
Understanding the reactivity series for chemical extraction.
Aluminium, Zinc, and Iron do not react with cold or hot water but react with steam.
Sodium and Potassium react violently with cold water.
Option B (Aluminium) also reacts with steam but is often categorized as less reactive than Magnesium in many textbooks regarding standard water reactivity.
B is correct тАФ Magnesium reacts with steam but is inert to cold or hot water due to its moderate reactivity position in the series.
Always remember: reactivity decreases down the group and across the period for metals; memorize the reactivity series order to solve all similar questions.
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