From the metals copper, iron, magnesium, sodium, and zinc, select a different metal that does not react with cold water but reacts with steam when heated.
Also, arrange the given metals in decreasing order of reactivity.

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Solution

The metal that does not react with cold water but reacts with steam is Magnesium.
Magnesium reaction is slow with cold water but vigorous with steam because of the formation of insoluble Magnesium hydroxide.
Magnesium does not react with cold water due to the formation of magnesium hydroxide as a coating that is insoluble. This prevents the water coming in contact with Magnesium.
The reaction of Magnesium with steam to form magnesium oxide and hydrogen gas.
$Mg (s) + 2 H_{2} O (g) {Steam} \to Mg {(OH)}_{2} (aq) + H_{2} (g)$
Metals in decreasing order of reactivity:
Sodium > Magnesium > Zinc > Iron > Copper.

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From the metals copper, iron, magnesium, sodium, and zinc, select a different metal that does not react with cold water but reacts with steam when heated. Also, arrange the given metals in decreasing order of reactivity.

From the metals copper, iron, magnesium, sodium, and zinc, select a different metal that does not react with cold water but reacts with steam when heated.
Also, arrange the given metals in decreasing order of reactivity.