Question

Alumino thermite process involves reduction of Chromium with oxide and aluminium.
A) True
B) False

Answer 1

Hint:Thermite process is an exothermic process in which an oxide gets reduced. It is a process used for the separation of many metals.

Complete answer:
So in the question, we are supposed to comment on the statement, whether the said statement is correct or wrong.
Before commenting on the statement, let’s have some idea about what an alumino thermite process is?
A thermite reaction is that reaction of iron oxide which reacts with aluminium and gets reduced to iron metal. A thermite is actually a pyrotechnic which is a combination of metal oxide and a metal powder.
When this thermite mixture is given heat, then the thermite mixture undergoes an exothermic oxidation –reduction reaction i.e. a redox reaction.
In the thermite process various metals are taken as the fuels like aluminium, zinc, silicon, magnesium and boron. Commonly used fuel is aluminium because of their availability, high boiling point and is cheaper than the others.
Oxidizers used in the thermite process are –Boron (III) oxide, Chromium (III) oxide, Silicon (IV) oxide, Iron (II, III) oxide, Manganese (IV) oxide etc.
This process is also called the Goldschmidt process, used for the thermite welding of railway tracks.
In the alumino thermite process the fuel used is aluminium powder.
In the thermite process, almost all the metal oxides can be reduced using the appropriate fuel, we generally use the Al powder.
So here the oxide is chromium oxide and it gets reduced to Cr metal using Al powder, which forms stronger bonds with the Oxygen and reduces the chromium oxide to Cr metal.
A redox reaction is taking place and we can write the equation of the reaction as,
$C{{r}_{2}}{{O}_{3}}+2Al\to 2Cr+A{{l}_{2}}{{O}_{3}}$

Hence we can conclude that the statement is true. The Alumino thermite process involves reduction of Chromium with oxide and aluminium.

Note:Magnesium oxide is not reduced using the alumino thermite process.
Reduction process means either the oxidation number of an atom is decreased moving from reactant to product side or it is the gain of electrons of the atom during the chemical reaction.
The Alumino thermite process is one of the effective methods for the separation of metals from the metal oxides.