Question

Anhydrous iron (III) chloride is prepared by:
(A) Direct combination
(B) Simple displacement
(C) Decomposition
(D) Neutralization

Answer 1

Hint: Compounds are prepared by many methods. Some methods are direct methods of production in which the elements of the required compound are reacted together to produce the compounds. These are direct methods of production.

Complete answer:
To answer this question we should know about the various processes mentioned in the question.
> Direct combination: In this process the elements of the required compound are heated together to form the compound.
> Simple displacement: In this type of process one element replaces the other element from the reacting compound to form the new product.
> Decomposition: In this type of reaction a compound breaks into two or more compounds providing energy in the form of heat, light or electricity.
> Neutralization: In this type of reaction an acid and a base react together to produce corresponding salt and water.
So, we have gone through all the given processes.
The process by which anhydrous iron(III) chloride is produced is a simple combination.
In this process iron metal is heated with dry chlorine gas.

\[2F{{e}_{(s)}}\,+\,3C{{l}_{2(g)}}(dry)\,\xrightarrow{\Delta }\,2FeC{{l}_{3}}\]

Hence, the answer for the given question is option (A).

Additional Information $FeC{{l}_{3}}$ is used in sewage treatment and in itching of copper in the redox reaction to produce printed circuit boards.

Note: Students might get confused and mark decomposition as the answer. Hydrated $FeC{{l}_{3}}.6{{H}_{2}}O$ on decomposition breaks into $F{{e}_{2}}{{O}_{3}}\,,\,{{H}_{2}}O\,and\,HCl$ instead of anhydrous $FeC{{l}_{3}}$. So, decomposition will be an incorrect choice.