Question

What type of reaction is this? $Zno + C \to Zn + CO$

Answer 1

The given reaction is redox reaction. The redox reaction is an oxidation-reduction reaction is any chemical reaction in which, by obtaining or losing an electron, the oxidation number of a molecule, atom, or ion varies. There are five main types of redox reactions: combination, decomposition, displacement, combustion, and disproportion.

Complete answer:
Redox is a type of chemical reaction in which the oxidation states of atoms are changed. Redox reactions are characterized by the actual or formal transfer of electrons between chemical species, most often with one species undergoing oxidation while another species undergoes reduction. The chemical species from which the electron is removed is said to have been oxidized, while the chemical species to which the electron is added is said to have been reduced. Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. Reduction is the gain of electrons or decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule.
The above reaction is an example of a redox reaction, which means both oxidation and reduction occurs simultaneously. Here $C$ is oxidized as it has lost electrons and $Zn$ is reduced as it has gained electrons.

Note:
In redox processes, the reductant transfers electrons to the oxidant. Thus, in the reaction, the reductant or reducing agent loses electrons and is oxidized, and the oxidant or oxidizing agent gains electrons and is reduced. The pair of an oxidizing and reducing agent that is involved in a particular reaction is called a redox reaction. A redox couple is a reducing species and its corresponding oxidizing form