Question

Which of the following metal reacts reversibly with steam?
a.) Aluminum
b.) Copper
c.) Lead
d.) Potassium
e.) Iron
f.) Sulphur

Answer 1

Hint: In order to solve the given problem first we will understand the meaning of the terms reversible reactions with the help of some specific examples. Further we will see the reaction of the metal whose reaction with steam is reversible. On the basis of the chemical reaction and the understanding of properties of the given metals we will select the correct option.

Complete step by step solution:
First let us understand the meaning of reversible reaction.
A reversible reaction is a type of reaction in which there takes place the conversion of reactant to product and also there can be the reaction between the products to give back the reactants.

For example, let compound X react with Y to give products A and B. But on reaction of compound A with B, if we can get back our initial compound i.e. X and Y then such a reaction is known as a reversible reaction.
Reaction from hydrogen gas and iodine vapor to hydrogen iodide is one example of a reversible reaction.

Now let us move to the solution part and analyze the reaction of each of the given options with water and steam.
Amongst the given options copper and lead does not react either with water or with steam.
Sulphur also does not react with water.
Potassium reacts with water but these reactions are not reversible.
Aluminium reacts with steam but the reaction is not reversible.
Iron reacts with steam water and does not react with normal water. Also the reaction is reversible.
The reaction between the iron metal and the steam water gives metal oxide as well as hydrogen gas. Also this reaction is reversible. Let us see the chemical equation representing the reaction.

$2Fe\left( s \right) + 3{H_2}O\left( g \right) \to F{e_2}{O_3}\left( s \right) + 3{H_2}\left( g \right)$
The given is a reversible reaction.
Hence, iron metal reacts reversibly with steam.

So, the correct option is E.
Note: In order to solve such types of problems students must remember the reactivity series of the metals which contains all the metals in the order of their reactivity. Also students must remember that iron when reacts with water and oxygen the product formed is rust which is very dangerous for the iron and steel as it degrades the quality of metals and slowly the metal is totally wasted if not taken proper care.