Answer: Option (A) is the correct answer.
Explanation:
When two different atoms combine together in similar composition they result in the formation of a compound.
And when a chemical formula include water molecules then it is represented by a dot followed by compound formula and then number of water molecules along with water formula are written.
For example, [tex]MgSO_{4}.7H_{2}O[/tex] is a compound that has seven water molecules.
According to naming nomenclature, "hepta" will represent seven.
Thus, we can conclude that name of [tex]MgSO_{4}.7H_{2}O[/tex] is Magnesium sulfate heptahydrate.
