Answer: [tex]MgSO_4.7H_2O[/tex]
Explanation:
[tex]MgSO_4[/tex] is an ionic compound because aluminium element is a metal and hydrogen element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written in case of [tex]SO_4^{2-}[/tex] is '-ate'.
Hence, the name of [tex]MgSO_4[/tex] is magnesium sulphate.
The water of crystallization is written as hydrate with the number of water molecules. As the name is heptahydrate, that means 7 water molecules are present.
Therefore, the correct answer is [tex]MgSO_4.7H_2O[/tex]
