Question

What happens when Crystals of $FeS{O}_4$ are heated?

Answer 1

Hint :The process or effect of breaking down a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments is known as chemical decomposition or chemical breakdown. Chemical breakdown is often thought of as the polar opposite of chemical synthesis. In simple terms, a decomposition reaction is a chemical reaction that produces two or more products from a single source.

Complete Step By Step Answer:
The intricacies of a decomposition process aren't usually well defined, but part of it is: breaking bonds requires a lot of energy. Because all decomposition processes tear away the bonds that keep it together in order to generate its simpler fundamental elements, they all require some type of energy to some degree. The majority of these reactions are known to be endothermic as a result of this fundamental law, however there are exceptions. When a chemical substance is subjected to severe environmental conditions such as heat, radiation, humidity, or the acidity of a solvent, its stability is eventually harmed. Decomposition, on the other hand, is being employed in an increasing variety of applications.
 $2FeS{O}_4(s)\to F{e}_2{O}_3(s)+S{O}_2(g)+S{O}_3(g)$
Water molecules can be found in ferrous sulphate crystals ( $FeS{O}_4.7H_{2}O$ ). Anhydrous ferrous sulphate (FeSO4) is produced when ferrous sulphate crystals lose water when heated. As a result, their colour transitions from bright green to white.
Anhydrous ferrous sulphate decomposes into ferric oxide ( $F{e}_2{O}_3$ ), sulphur dioxide ( $S{O}_2$ ), and sulphur trioxide when heated further (SO3). As a result, the gas released has a sulphur-like odour.
The single ingredient $FeS{O}_4$ decomposes into three distinct products in this reaction. As a result, the reaction is classified as a decomposition reaction.

Note :
Other breakdown processes need the use of external energy. Heat, radiation, electricity, or light are all examples of energy. The latter is why various chemical substances, such as many prescription medications, are maintained and stored in dark bottles to prevent light from reaching them and causing breakdown.