Question

The reaction, $KI + {I_2} \to K{I_3}$ is:
A.Oxidation
B.Reduction
C.Complex formation
D.None of these

Answer 1

Hint: The compounds made up of a central metal atom, which is a cation surrounded by negatively charged anions is known as complex. The total charge is balanced in a complex. The negative charge is equal to the positive present on the complex.

Complete step by step answer:
The chemical process in which the reactants (one or more) are converted into products, the reactants can be the elements or the chemical compounds. The main work of the chemical reaction is to rearrange the atoms of the reactants and transform them into new products.
And when the atoms in a chemical reaction are balanced, means the number of atoms present on the reactant side is equal to the number of atoms in the product side then the equation for the reaction is considered as a balanced chemical equation.
In terms of oxygen transfer, the addition of oxygen to a compound is known as oxidation and the removal of oxygen atom is known as reduction. When both take place simultaneously the reaction is considered a redox reaction. The molecule which donates oxygen is known as an oxidizing agent and the molecule or atom which gains the oxygen atom is known as a reducing agent.
We have given a balanced chemical equation, the reaction is as follows:
$KI + {I_2} \to K{I_3}$
Potassium iodide reacts with iodine to form $K{I_3}$ .

$KI$	${I_2}$	$K{I_3}$
$ - 1$	$0$	$ - 1/3$
oxidation		reduction

The oxidation states are written under the symbolic representations of the molecules.
As we can see that in this reaction oxidation, reduction and complex formation takes place.

So, the correct answer is Option A,B,C.

Note:
As we all know that chemical reaction is nothing but formation of new products from the rearrangement of atoms in the reactant molecules. The chemical reactions are classified in four parts: combination reaction, decomposition reaction, displacement reaction and double displacement reaction.