Question

In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :

Hydrogen, Oxygen, Steam, Chlorine

Answer 1

Answer:- Steam

Others are the name of elements (atoms) but steam is not an element.

Elements – Elements constitute the simplest chemical substances in which all the atoms are exactly the same.

hydrogen ($H_2$), oxygen ($O_2$ ), and Chlorine ($C{l}_2$) are elements as they exist with their atom only.

Compounds – Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.

Steam is a compound that is formed after the reaction of two elements that is oxygen and hydrogen.

$H_2+O_2⟶H_{2}O\left(Steam\right)$