Question

What's the utilization of oxidizer in Rocket Engine?

Answer 1

Hint: Oxidizers are present in the form of solids, liquids, or gases that react readily with most organic material or reducing agents with no energy input. Oxidizers are a severe fire hazard. They're not necessarily combustible, but they will intensify combustion and increase the flammable range for chemicals in order that they ignite more readily.

Complete step by step solution:
A rocket uses the stored rocket or the propellants as the reaction mass for forming a high-speed propulsive jet of fluid, which is usually high-temperature gas. Rocket engines are the reaction engines, producing the thrust in accordance with Newton’s third law.
Liquid oxygen or LOX is employed because of the oxidizer. The boosters use aluminium as fuel with ammonium perchlorate because of the oxidizer, mixed with a binder that makes one homogenous solid propellant. The fuel for the most engines i.e. Hydrogen is the lightest element and normally exists as a gas.
To increase the precise heat of rocket propellant combustion, it's necessary to use an oxidant containing oxygen compounds in sufficient quantity and within the lowest degree of oxidation. The lower the oxidation degree of the oxygen atom within the oxidizer molecule, the more electrons it'll deduct from the fuel.
Liquid oxygen is the standard oxidizer utilized in the most important US rocket engines. It's chemically stable and noncorrosive, but it’s extremely coldness makes pumping, valving, and storage difficult. If placed in touch with organic materials, it's going to cause fire or an explosion.

Note:
A rocket needs a lot of propellant, which consists of fuel and therefore the oxygen (or other oxidizer) needed to burn the fuel. Since it flies in airless space, a rocket must carry its own oxidizer, which weighs much more than the fuel.